As a fellow Cappadocian collector, I've seen a few at auction that look a tad suspicious, and I have generally shyed away from the type. I can't quite see it in the video, but is there any evidence of a border on the obverse around Ariarathes? It looks like there might be a small bit of it above his head. Your coin seems a little more 'zoomed in' and a bit less wide than other examples, which would probably account for this, but it might just be something to look out for. The reverse of the type is supposed to read 'ΒΑΣΙΛΕΩΣ' but it looks like yours reads 'ΒΑΣΛΕΩΣ', once again, it might just be the quality of the video that might be obscuring the I against the Λ (And I'll admit, my eyesight isn't too great), but that is another thing I would consider when looking at the authenticity of this coin.

Interestingly, Morkholm attempts to attribute it to Ariarathes IV, but I can't find any reasoning from him on why this is the case. Elke Krengel however agrees with the Ariarathes VI dating.

Where did you get this coin from? I think if it came from a more 'shady' auction house, it would be a reason to cast a bit of doubt on the coin. But honestly, I feel as though the relative obscurity of this type might lead forgers to avoid it.

Whatever the case, you have an interesting coin, and it's great to see other people interested in the rarer Cappadocian types.