https://www.nytimes.com/2023/04/07/us/politics/classified-do...
Canadian Broadcasting Corporation wrote about it https://www.cbc.ca/news/world/ukraine-russia-military-leaks-...
One of the first reactions from the government and Ukraine was that this was all Russian disinformation. Then within a couple of days other media sources weighed in and there was considerable debate, until this guy was identified.
So yes. Many people have hypothesized this was Russian disinformation.
Here's two more: Al Jazerra: https://www.aljazeera.com/news/2023/4/10/us-scrambles-to-fin...
and NBC: https://www.nbcnews.com/politics/national-security/pentagon-...