From your screenshot, I count 25 veterans, 6 regulars, and 7 conscript infantry (plus 1 veteran guerilla).
This is quite honestly nothing at all. They have exactly 1 town in range which is easy to defend with 40 units. If Nuts attack, they will lose many more shields than we do since even hoplites fortified in a city are almost 50% against infantry.
The greater threat is that they will wait for more troops and/or KISS will land, but how many more could they have? Hopefully we will find out by upgrading our cannons and watching the strength. I doubt they could land significantly more units next turn - if they had more boats, they should have used them to bring more units this turn.
All in all, I think their sudden crowing making it seem like MIA is in trouble is kind of comical.