He chose to relay false information from un trustworthy source, in a way that damaged the ubiquiti brand, and this took some time and energy from ubiquiti employees to fight those false accusations.

Here he is saying "Yeah, here is $0 for your troubles, I'll be doing the bare minimum so you can't drag me in front of a courthouse anymore". He is literally posting a 1 paragraph piece of text.

"Enough" would be : "I am going to fully compensate you for the damages I have done by lacking professional integrity, and making extraordinary claims while lacking the required extraordinary proofs that usually come with them. Please send me a bill for the salaires of the technical staff, marketers and lawyers that had to be pulled from more important projects to fight the fake news I relayed. I understand that you have had to pay these people so you are not going to profit from this and this only allows you to break even on this whole mess. I note that - going forward - this will be used as an additional compass for me as I understand that my words have real, tangible consequences for the people involved and I will avoid putting anyone in danger without putting myself on the hook as well."