I was taught back in the day the seat height was adjusted so that the flat of the foot must be on the ground.
Roll on nigh on 50 years I was re educated to the intricate, time consuming, trials and errors of finding that seat height/handle bar position. After 200 miles still can't find it on my new bike.
Yeah definitely big bloke on wee bike.
Though I see it's some sort trail bike. Does seat positioning of road biking apply to off road?
A dinni ken!
For mountain biking the seat positioning is the same just a bit lower.
I use the same height on MTB as road, Its the most efficient postion so why change it, I have a dropper post for the downhill stuff.