A lot of vertical short videos are 22 from Olas, I think. 21 is not used yet. It’s all over the place … hardly any meta data is filled. No thumbnails, no duration, no dimensions 🙃

Yes, the nip has been changed to use non replaceable events:

NIP71 - NIP-71 - Video Events

Read more about the NIP71 on {{appUrl}} - NIP-71 - Video Events