I believe @ryan said these three characteristics of pines is how they should be treated and default for pines would be Short-Needle Single-Flush.
Another identifier was a terminal bud emerging between the 2 needles on Multiflush. @ryan mentioned this in one of the live streams, but I can’t remember which one, it might have been the Pitch pine (Pinus rigida) stream https://live.bonsaimirai.com/library/video/pitch-pine-design. Anybody correct me if this info is wrong
I found this info on pines http://ottawabonsai.org/wp-content/uploads/2018/12/OBS-Pine-2018.pdf
So it looks like Austrian Pine falls into the Long-Needle Single-Flush category.