Mustard oil has been used in the subcontinent since the Indus valley civilization 4,500 years ago. It’s extremely well understood. Unlike solvent extraction of oil.

You write this as if there isn't controversy about mustard oil, which is banned in the United States because it contains high levels of a likely heart toxin ("Among South Asians living in the US, ASCVD risk is four-fold higher than the local population") and limited throughout Europe. The entire point of solvent extraction is convert rapeseed oil, which would otherwise be similarly problematic (they're basically the same plant!) into something less toxic than mustard oil (that's literally why it's called "canola").

I don't care either way; let the mustard oil flow. I don't buy the mustard oil thing either. Just don't pretend that mustard oil is somehow healthier than canola. Use whichever fat tastes best to you.

Canola oil is simply a mustard-seed oil from a hybrid mustard bred for low erucic acid content. Solvent extraction is widely used, but not something that defines canola oil. Cold-pressed and expeller-pressed canola oil are also produced on a smaller scale.

No, in populations which traditionally use mustard oil heart problems are common. So it's time tested to cause heart failure.