NATO training is bad and insufficient...
NATO trainers have no experience in a war against an equal enemy. They have experience against insurgents, without artillery, air defense, air force, tanks, anything. They have experience in fighting from the position of power. They must have theoretical knowledge, but no practical one. So the training they give to Ukrainians is subpar.
The real significance in NATO training is that it can be done without the risk that a Russian rocket hits and kills a whole fucking company on spot. It is probably a learning experience for NATO on how to train large mass of troops in a relatively short period of time.