Yeah... I saw that, but...
1) He has 3 cards and only showing one of them and...
2) Maybe they are patched up to 3.5...
3.5 was a custom mailorder upgrade of the rom + installation instructions. if you just put a 3.5 on your card you might bust your system.
I suspect that some later systems were sold with v3.5, However, unless you can get a photo showing a v3.5 label, I wouldn't take the risk. I tried this a while back with similar sellers on AliExpress and they would claim they have v3.5 but would never send me a photo.
It's unlikely you'll damage your system; most likely it just won't work without appropriate setup.
