That I am not sure about...I know that is the case with the equatorial PAC and ATL but not sure if that is the case off the EC. I would think they are probably to some degree but probably negligible really.
I just thought it was a pointless tweet because if SSTAs were 65 versus 45 right now off the EC or early in tropical season, that would have no bearing on increasing/decreasing potential for tropical systems to survive farther north. Hell, if they were 71 versus 45 there still would be no difference. SSTs below 80 are going to have a negative feedback on tropical systems.