But it's a genuine shed.
But of course !

Also if you replace the nuts in your levelling knobs with nylock locking nuts - once it's physically levelled - it STAYS levelled.
Often for years :-)

So a physically flat bed and locking levelling nuts = the best and most permament solution to levelling a printer bed.

My sapphire pro was levelled once - last june, I think. And this week I've been making base plates for pc motherboards and using the entire build area. print speed 150mm/s - first layer speed 50mm/s.
That's when you find if a bed is still level - and yes it is ! :-)