I found also little play in swingarm and it seems upper shock attachment, so.... I take whole thing apart (swingarm, linkage, shock) and give everything a good grease (old factory grease looks like yellow plastic).
Putting all back together, tightening..... and the play is there anyway
Ok.... repeated whole thing one more time.... no luck, sill have movement up and down maybe 1mm. Everything looks nice - bearings, shafts etc.

But if you say it's normal, then ok I will not pay any attention on it.