Yeah, so, (you might know better than I on this one) I believe trichoderma acts almost as a predator to mushroom mycelium.
It's the one mold (in my experience/understanding) that can compromise a fully colonized axenic substrate... and usually will at some point in time.. after however many flushes, when the mycelium colony starts to weaken.
I don't have any experience with sterilizing such coirs. I would be very skeptical about using it even if I put it through the pressure cooker for a few hours at 18psi.
Here's the stuff I use. Each of those bricks expands to about 8 - 9 quarts, properly hydrated. So, 24 - 27 quarts out of each package. Plenty to get you started.
Just saw your comment about Amazon.ca. That's my general point of reference. $11 for that zoo med coir isn't too bad, I pay $7 if I'm not buying in bulk.
And... criminal... Bezos...
Sorry if I'm dropping a little too much detail here. I'm sure you're just looking for yes/no, which, feel free to ask again when you have everything in front of you.
I like to load up on theory to develop a mindset and then poke holes in that theory once I'm in practice.