> If there is no oxygen in space does that mean bodies in space can stay preserved?

Well they won't rot, but there's still heaps of various types of radiation and micrometeorites that'll slowly cook and chip away at anything left in space.

A body in space would mummify first from vacuum dessication before all that has much effect though.

> Seen a Tik Tok about the amount of people deceased in space and they’re floating about

Zero? There are zero intact human cadavers in space.