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does LFP stand for less fire prone?

LFP stands for LiFePO4, or lithium iron phosphate, a sort of battery chemistry. See https://en.wikipedia.org/wiki/Lithium_iron_phosphate_battery

It's cheaper but with less capacity, so I guess it's alright for the second car that is strictly used for commuting.

Less energy density. Capacity is dependent on size of the pack.

Notably it’s lower energy density by weight, but not substantially by volume.

True, I was thinking about density. Unfortunately weight to size for an EV is complicated and more weight is not good.

LFP is pretty much already here. It's mainstream enough that's it's shipping in Teslas. The catch is that while LFP is cheaper and less fire-prone than more traditional lithium ion batteries, it's less energy dense. So it's unlikely to be solving range issues any time soon.