[TXnMA]

"If a partial cause was lithium-ion battery banks, well, let’s just say they ALSO blow up real good, with not a lot of goading.."

IF it WAS a significant explosion, I would expect that, rather than a single high amplitude, sharp impulse, high VOD explosion like a penetrator bomb, big IED or a nuke, it was small "trigger" explosion(s) that set off something(s) already inside the facility, like you mention.

Instead of the sharp P-wave seismic impulse expected from a high-VOD explosion, I would expect a flame front that spread rapidly through the facility, overpressured it, and vented through the reverse-pressured blast door seals with a prolonged, "Whoosh!" that ejected a cloud of dark ejecta (heavy "soot") onto the surrounding surface. [Blast door seals are designed to keep high pressure OUT, rather than to keep it IN...]

That "flame front" would have produced a low-amplitude, long period seismic signal like a Rayliegh wave -- which would not look like an explosive "event" to short-period seismographs.

[Marine_Uncle]

Perhaps in due time, if indeed the facility experienced a catastrophic explosion, we might gain some level of understanding as to what went boom, and why.
I'll reserve comments to that level. To much conflicting reporting on this issue to date, to ascertain the validity of claims.