This could very well be the explanation. However, Leo says he experienced the delay in preparing disclosure relating to recent developments.
The 10-q is for the period up to Dec. 31, 2020. So what happened (recent developments) on or around the filing date (Feb. 16, 2021) that required disclosure in the 10-Q for the quarter ending Dec. 31, 2020?
Leo experienced a delay.
Delay doing what?
Preparing disclosure.
Disclosure for what?
Recent developments relating to the trials in the U.S. and Russia.
When did the recent developments occur?
On or around the filing due day.