The gist might have been that the Russian envoy did appear at the location but wouldn’t negotiate

https://www.yahoo.com/news/die-welt-publishes-peace-deal-230752941.html

https://www.reuters.com/world/europe/russian-negotiator-confirms-several-long-conversations-took-place-with-ukrainian-2022-04-22/

https://www.livemint.com/news/world/putin-publicly-shows-draft-of-peace-treaty-signed-by-russia-ukraine-in-2022-watch-11687136116863.html