Yeah it seems too good to be true.
Especially for me.

I was told that it was only supposed to be a simple "copy and dump" of files into the new host, and it would be up to me to sort out the settings... so the database shouldn't have been set up to work with the settings it needs, nor should it have been able to work on the php settings of the new host.

Actually... I wonder if the board software at the new host is still drawing from the database on the old server, as the "server host" would need to be changed on one of the configure files... and the last time I messed with that file, I lost the board for a week.
I will have to go see if I can find that out, because if it is still drawing from the database on the old server, it will disappear if I can't figure out how to set up the database at the new host before tomorrow.

I will maybe do the upgrade on the weekend (so that if there are problems, I have a whole weekend to figure it out).

And I will still need to get a professional into look into what mess has been left for me, because when I was cleaning out the old server host of unwanted files, it looked like there were 3 copies of the board sitting in there, thanks to the person who moved and upgraded the board for me during the last move. I just didn't want to delete any of them before I could get someone to say for sure that two of them were unwanted duplicates.