I don't think there is much to make of it. The dates are either an Americanised 9th and 11th of September, or this Sunday just gone and the 9th of November. Only the latter makes any sense in terms of his prediction of a massive geological trauma in Iceland in November.
He is unequivocal in his middle sentence, both that 'they' created the magma wave this morning and that 'they' are going to 'blow the big Katla' in November in order to disrupt Iceland. Quite why 'they' have got it in for Iceland is, as you suggest, a major mystery that only he can enlighten us on. Neither do I understand how or why the subsequent catastrophe could be blamed on the eclipse.
It's a bit like the Ricky McCormick case. There is a natural inclination to find meaning in apparently complex human constructs, but when it evades all attempts at interpretation, eventually you have to come to the conclusion that it's just raving.
Perhaps 'they' are planting the explosives during the eclipse, ready to set off the 'big Katla'.
That'll give 'em around 5 minutes to get into Iceland, prime their kit and vacate again. However, given how immigration control can be, 'they' probably wouldn't get pass baggage checks before everything blew up.
Or something.
In fact I'm getting bored of trying to interpret the writings of a loon, as you said it's probably down to raving-ness. So, here's a nice poem I wrote:
I'm eating a bowl o' porridge.
Chopped banana,
But no raisins.
The postman's late today.
Ooh. You're trying to drag voodoo into this now. Well done.
Why is Iceland being targetted? And by whom?