Qapla'! I'm a Kbinner using Kbin, both of those links work for me. This is really cool, until now I haven't followed anyone on the Fediverse, and now my firsts are Takei, Ryan, and McNeill. Thank you maegul and JustinFTL for the info!
Generally any platform will have a way to work out what to do with the direct link that goes straight to the original instance of a user of their post, which is why that's what I provided.