Yes, the British Cycling policy came in in May last year and the UCI (the world governing body) adopted a virtually identical policy in July. It’s worth noting that there has never been (to my knowledge) a transwomen on the podium in a BC race. The ban came in due to the Emily Bridges situation where a male cat 1 (the category below elite) transitioned and announced their intention to race as a woman. They never actually competed as a woman in a BC or UCI sanctioned race.
The only national federation that has derogated from the UCI is, predictably, Cycling USA, so males can still ride in any US domestic race that isn’t UCI sanctioned. However the big issue in the US is that traditional racing is absolutely dwarfed, both in terms of money and participation, by gravel racing. The gravel scene is completely unregulated and full of dopers (there is no testing) and a substantial number of men racing as women.