From the name it's something capsicum (ie: hot peppers)-based?

That'd be a loss of time. My squirrels have eaten last summer everything from shishito to japaleno and even habanero - so anything capsicum obviously doesn't work with them as it sometime, apparently rarely, does with some types of squirrels.

I tried blood meal which doubles up as a fertilizer and that rodents normally hate (works well enough for mice etc.), but it appears they're not put off one bit by blood either.

Anyway.... the squirrels aren't squeamish about how cruel life is. They understand perfectly that it's a fight for food and territory and they want mine, and I'm sure they expect me to fight back as in my place they would. They just don't get yet that humans are slow, can't chase after them up beams and don't look all that dangerous, but when they're pissed off they fight dirty.

They're not nice easily frightened squirrels either. They're big and ugly, and one nearly attacked me last year.

I was under the impression you hated them too, though...