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My eldest is on an Orbea 20 inch thing which I really rate. It's like a proper little mountain bike. Their kids range is great, including the 24in as they do a versions with different levels of bling - ours is rigid and v brakes, but with good tyres and lighter ally fork. It's been perfect.
They also do a rigid hydro disk version, and then a bouncy pimped one with an air fork.
All a bit cheaper than other options at same kinda spec I think.
https://www.tredz.co.uk/.Orbea-MX-24-Team-Disc-24w-2020-Junior-Bike_216278.htm?https://www.tredz.co.uk/.Orbea-MX-24-Trail-24w-2020-Junior-Bike_216277.htm?
If you were seriously looking to get him a capable and proper 24” I’d take a look at these:
https://www.thelittlebikecompany.co.uk/product/woom-off-5/