I don’t see his point.
If you have a car in stock for £100k and sell it 2 days after the end of the accounting period for £80k, that is solid evidence your stock was overvalued at year end, and on audit will probably be required to provide for the loss within the accounting period. You don’t uplift stock value as you think it becomes worth more, you just make more gross profit when you sell it. You never ever go back and push profit into a prior period based on excessive profit earned subsequently.
Players are different, they are fixed assets. You don’t value fixed assets at the lower of cost and net realisable value, you record at cost then depreciate/amortise over their useful economic life or contract length if relevant. You may impair fixed assets if they cease to be useful etc. I’ve sat with a PL manager discussing player by player whether they needed impairing, he couldn’t have been any less interested. And rude.
Anyway, Forest don’t need to prove Johnson was worth more at the close of the accounting period. That gains nothing.
To be really obtuse, you could say they could have sold for the lower value before the accounts closed (as we did with Richy) and complied with PSR but chose to deliberately delay to sell for more, and those extra funds could be reinvested - presto - a deliberate breach resulting in a sporting advantage.
It’s all nonsense. Football and accounting should not be so entangled as they are now.