Meh...memorandums are worth about as much as the paper they’re written.
I’ll wager Erdogan reneges on this deal at least once before the end of the year.
Irrelevant what Erdogan does from here. Sweden and Finland are joining NATO and that part can’t be undone.
What is also important here is that Turkey is supporting NATO and not Moscow.
At least once. 
The neoconneds around here don't understand geopolitics. Erdogan does.
The Turks will questioning PKK guys from Sweden and Finland in the basements of the Turkiye Lubyanka, right quick.
And the Western Media will be mum about that little development...