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You are right
...and my use of "plutonic" is either outdated or plainly wrong.
I found this for anyone who wants to read more :
https://en.m.wikipedia.org/wiki/Lava
"Properties of lava"

Because of the role of silica in determining viscosity and because many other properties of a lava (such as its temperature) are observed to correlate with silica content, silicate lavas are divided into four chemical types based on silica content:
felsic,
intermediate,
mafic, and
ultramafic.

The difference there was that it came up under the glacier Eyjafjallajökull and the magma meeting ice caused steam explosions throwing ash and other material high in the air.

Oups, maybe this is an outdated terminology : I couldn't find any references to support it. Please read my other comments and "edit" around here.

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Thank you for the link! That was deeply satisfying to watch. The camera quality is so good.

I'd love to see that in person. It looks massive.