No, he says that no matter what mempool policy you apply on your personal node, you will get a valid block either way.

And the global consensus is that you can put more than 80 bytes in a OP_Return no matter what version you are running.

Running Knots changes absolutely nothing. How bitcoin works or what miners can put in blocks. It just changes your personal mempool. nothing more, nothing less.

The funny thing is that you can upgrade to core 30 and change the value manually to whatever you want it’s up to you. You don’t have to change the implementation because of this change