Its a technique that is great when applied properly.
I'm not watching the video, because I can tell from your summary that she is a dope.
Its like saying I hate baking because it messes up scrambled eggs.
184 is low for veg.
A few degrees higher is a big difference. I'd do 190F for carrots.
Seasoning is often a lack of salt,esp with SV. I'd SV it, then salt the surface and maybe some sugar and then sear it.
To be sure.
But the regulations aren't always rational. This stock was sterilized... literally.
I recall Ruhlman advocating leaving it out.... uncovered... on this very site. That was a bad idea.
If you left it in the closed pot , even though vented, i dont see an overnight risk
The 15 min at pressure referred to the original cook. And I'm sure it was longer.
Although some food safety rules would have a problem with the stock, if it stayed sealed in the IP it should be fine.
Even moreso if it was cooked for >15 minutes at pressure cooker temps which is the equivalent of an autoclave.
Masontops Pickle Pipes - Waterless Airlock Fermentation Lids - Wide Mouth Mason Jar Fermenter Cap - Premium Silicone Top (eG-friendly Amazon.com link)
Anyone ever use these? Looks like just the right size for me. Great size for experimentation.