I've been in similar architecture to the story and have never been in anything like it again. This wasn't a simple, old person lost in a normal place.
I have a recurring dream about it, it was so different. Although I urban explore I was just looking for a exit, and I guess because I urban explore I didn't notice the signs so I suddenly went from bright shops to a dark deserted maze.
You are not alone with that precaution. Ages ago, before plastic gift cards were ubiquitous, I used to quest/urbex with shims of thin aluminum trimmed to door jamb size (making them harder to detect).
The buddy system also was used - "You stay on this side, I'll go through and test it can get opened from the other side."
Extremely useful when entering campus/city steam tunnels that may not have another good door for hundreds of meters (the tunnels were secured to prevent access to the structures they connected).
For those with less patience the story of Bernard Gore is told in many articles including this one:
https://www.news.com.au/lifestyle/real-life/nightmare-in-wes...
About 30 seconds for me because I can't watch talking heads (especially that close to camera) which have jump cuts between sentences. If you can't read it all smoothly in one go, don't appear on camera!
(I appreciate this is a niche complaint)
Ofc it’s him.
Please note that these stories are recreational and may contain parts that aren’t exactly real. Also real-based stories get mixed a lot with just horrors without explicit notice. Not saying that he’s intentionally tricky with it, but reality and fact-checking is not the selling point of this channel either.