Glass may impart more force upon the mug but it is certainly not likely to break itself. You would have to imagine they will use thick pyrex which you could use to drive a nail.
Then the fact that the inner cylinder is stainless steel means that if the glass shatters, you still have something supporting your hand. The inner cylinder might save you from life-altering lacerations to your hand. Might.
I'm not going to be the one to trust it. I've seen how much pressure people apply to aeropresses, and friends don't let friends push that hard on future shards of glass.
Yeah I'm less concerned about the brewer breaking under normal use, I imagine they've done due diligence there (though personally I would wait a year or so) but I'm more concerned if the mug shatters and then you have all this force shoving the brewer into the counter next is that enough to break it? Especially as the it hits a granite counter at a weird angle maybe with the flange or filter cap instead of the perfect circle of a mug on the normal mouth surface.
If this is the guy:
https://coffeechronicler.com/aeropress-xl-premium/
Then the fact that the inner cylinder is stainless steel means that if the glass shatters, you still have something supporting your hand. The inner cylinder might save you from life-altering lacerations to your hand. Might.
I'm not going to be the one to trust it. I've seen how much pressure people apply to aeropresses, and friends don't let friends push that hard on future shards of glass.