From Grok:

The Bolshevik decriminalization of homosexuality (1917–1933) had a very significant practical effect, but it was limited almost entirely to private, consensual behaviour between adults. It did not mean public displays, same-sex marriage, pride parades, or any kind of protected public gay subculture. Here’s what actually changed on the ground:

What decriminalization actually meant (1917–1933)

• No arrests or imprisonment simply for being gay or having consensual same-sex relations in private.
• Police could no longer raid private homes, blackmail people, or use “sodomy” as a catch-all charge (as they routinely did under the Tsars).
• Gay men (and to a lesser extent lesbians) who were careful and discreet faced almost no legal risk from the state for their private sexual lives. This was a huge improvement over the Tsarist period, when thousands had been prosecuted or exiled to Siberia.
• Courts and doctors in the 1920s sometimes released people caught in same-sex acts with a simple warning or medical referral instead of prison.

What it did not protect or encourage

• Public displays of any kind (kissing, holding hands, cross-dressing in public, etc.) remained socially taboo and could still get you arrested under other articles: “hooliganism” (статья хулиганство), “disturbing public order,” or “debauchery.”
• There were no gay bars, clubs, or openly gay organizations. The few pre-revolutionary “circles” in Moscow and Petrograd largely disappeared or went deep underground after the Civil War.
• Same-sex marriage or any legal recognition of partnerships was never on the table.
• Openly effeminate men or masculine women still faced massive social ostracism, workplace discrimination, and sometimes Komsomol/Party expulsion if they were members.

Reversal under Stalin (1933–1934)

• March 1934: male homosexuality was re-criminalized (Article 121, up to 5 years prison).
• Transgender medical care was suppressed, and legal gender changes became impossible.
• Official rhetoric shifted to labeling homosexuality a “degenerate bourgeois vice” or fascist perversion.

Note: "Transgender medical care" was basically one documented patient and some limited collaboration with Magnus Hirschfeld. The stuff about gender ID etc., I think is mostly speculative fumes picked up from activists. It doesn't surprise me that they're looking into dysphoria and potential treatments since it's a new field.