I'm not sure if their car audio division is still going strong (but I don't know squat about that). I think they have established pretty good brand recognition in the car audio market.
It does seem that they are at least closing out the Home Audio division. For some reason, the larger R263 tower is no longer present (maybe it might show up later) leaving only the smaller R253 tower. This Reference series keep staying around despite having these 60% off sales about 5 times a year!
I'm guessing they either have a lot of inventory piled up or just decided to keep making and selling them until the tooling for the parts wears out!
They were introduced in mid-2014, and per this article, the rumors of Infinity leaving the Home Audio division were around back then such that the introduction of this Reference series came as a surprise!
https://www.audioholics.com/tower-speaker-reviews/infinity-reference-series-speakers
Whatever they are doing, I guess we can be glad it results in these speakers being sold at a 60% discount periodically!