3DGS (NM) interview questions

I applied for this job from out of state and passed through three levels of online interviews before being told they would consider my application and return with an offer. I asked if I could get a site tour before accepting the offer and they agreed. This is when everything went off the rails. They postponed my offer until after the tour because they told me the offer was only good for 5 days and they wanted to be flexible for me. Instead I was given a verbal offer. The HR lady literally read me the offer and said "if I gave you this offer what are the chances you'd accept?" And I told her something like 80 or 90 percent. She said "okay, then we'll set up the tour, and we'll pay for your flight ticket and hotel stay." Several weeks pass and I don't hear any communication from them until I'm literally in New Mexico in their lobby. HR Lady takes me into her office and suddenly tells me I have 4 hours worth of "interviews" scheduled for the day. Until now it was a tour. Suddenly it's an interview. I was told I was through the interview process and at this point from my conversations with the hiring manager, I basically thought I already had the job, and the delayed offer was just for my own benefit and flexibility in start date. I had flown to NM thinking this would be a casual tour just for me to see the site and meet my team, so I didn't plan for four hours of anything. I had scheduled a full day of house showings so that I could get my living situation set up for when I make the move. I told HR Lady this and she says "okay that's fine I'll message the team and see if we can reschedule some of the interviews (again... what?) and in the meantime you can tour the facility. Before I leave her she gives me a statement of benefits and says that in case we don't speak again today I should hear from her by the end of the week with the offer. So a guy comes and shows me around the facility, and then puts me in a conference room and says he'll go check with HR Lady to see what the next step is. He comes back 1 minute later and says everything is cancelled and I'm free to go. I was confused, but I saw what I wanted to see already (the facility, the guys I'd be working with, my desk, etc), so I left. When I get back to AZ, they ghosted me for almost two whole weeks, ignoring emails, texts, calls, etc. Then I get a literally form rejection email, like the kind they send to new applicants, telling me they won't be "proceeding with my application." I called the hiring manager (who is actually a guy I used to work with at my current job and so I thought we had some amount of rapport) and he just tells me they went with another candidate and then gaslights me about my "unprofessional behavior" during the tour, including "bringing my girlfriend into a job interview" (exact words). My girlfriend flew with me to NM (I paid for her ticket) and she quietly sat in the lobby while I went in for the tour... Apparently that's unprofessional behaviour. He also alluded to some vague "professional questions" that I couldn't answer, even though not a single interview question was asked during this entire visit. Long story short, this was an absolute nightmare chapter in my life, and this company has unethical and non-standard hiring practices. Throughout the whole process it felt like they were winging everything, and I paid the price, wasting two months of my time and creating a ton of mental stress and uncertainty. Avoid this company.