This paper has a lot of nice data that does seem to indicate an overlooked distinctiveness, but to do taxonomic revisions without any genetic data on living species should not be a thing in 2025. Even if a species is so rare that such data is difficult to obtain it would seem better to wait.
Reposted from Ausarchosaur
There is a recent proposal to classify the Javan rhinoceros as its own distinct genus Eurhinoceros. So five species in five genera of extant rhino.

zookeys.pensoft.net/article/1278...

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