Steam just cracked 40 million concurrent users for the first time, meaning Valve's user count was bigger than 80% of the countries in the United Nations
In the fiscal quarter ending June 2024, Microsoft reported over 500 million monthly active gaming users across all platforms and devices
I assume that includes Windows as a platform, which would include Steam users as well. It's easy to look good when you include your competitor's numbers in your own.
PSN absolutely isn't higher. -Monthly- active users I believe is the only statistic they release though, and that will be significantly higher than concurrent on any platform.