If it wasn't KL's fault the ball wasn't changed but the ref's, then I would think KL's manager has a genuine reason to complain, unless he was happy thinking a flat ball might spoil Nott's game and said nowt. I haven't heard of any complaints but in any case it's too late now.
Here's a poser for you. Isn't a ball supposed to be ball-shaped? If it isn't then it's not a ball.
Got my grandson's football out of my garage, it was a bit flat because of time not used, COVID and all that... Thought I'd replicate the Reeves swerve in the back garden, it went straight over a six foot fence into next doors garden, Mrs Wedgie not impressed...Have to wait for my next door neighbour to come home from work to ask "Can I have my ball back please"... not bad for a 70+ year old