[noggin]

Does Kodi support hardware acceleration of Hi10p?

No - because there is very little hardware that accelerates Hi10p. In fact none of the mainstream stuff does.

You get hardware acceleration of H264, VC-1 and MPEG2 8-bit, with HEVC 8-bit also appearing. Some HEVC 10-bit stuff is appearing too but just because hardware can do 10-bit HEVC it doesn't mean it can do 10-bit H264 (aka Hi10p though this term is going to get confusing now...)

There are vague reports of a Rockchip SoC just released that claims H264 Hi10p support - but I don't think it has been confirmed yet - and Kodi support of 10 bit is still an interesting discussion.