That's explained in the above post, and in Chris Vickery's tweets here:

Chris Vickery thought that nostr:npub1sg6plzptd64u62a878hep2kev88swjh3tw00gjsfl8f237lmu63q0uf63m had a clock that was set to Moscow's timezone, and Vickery claimed that Dorsey was intentionally using that to send a "coded message" of some kind.

When Bitcoiners patiently tried to explain to Vickery that it wasn't an actual clock, but it was simply displaying the number of sats per dollar at that moment, Vickery doubled-down on his misconception, and inadvertently birthed the "Moscow Time" meme.