Xema, it’s a bit more complex than that. One also has to consider the geological matrix involved, as some will permit higher pressures than others.
Supervolcano is NOT a scientific term, it’s a popular press catch all term that has zero constraints or true definition.
A large igneous province may or may not erupt explosively. A Yellowstone type volcano ALWAYS has shown explosive eruptions.
But, at the “end of the day”, which is worse? An igneous province that released 1 billion tons of sulfates, methane, CO2, H2O and ash or the volcano that exploded with a total of the same numbers?
Either way, a large amount of “bad things” are released in a relatively short amount of time, the difference is one time of release of that amount. If it’s spread over centuries, it’s not THAT horrific. If it’s over a year or so or even a day, it’s a BIG deal.