I found out how to see all the short trades/covering on SZLS So when you see the short interest from iiroc you only see the position still not covered on mid and end of each months. But on this site you see all the short sales transaction history and you can easily calculate how much short were covered during the same period matching the iiroc consolidated information. Wow it makes my technical analysis so much fun now!
Now we know on period ended March 1st, 2021, 4% of all trades were shorts play! Just for a comparison, the highest short trades were reported on period ended June 16,2020, 24% trades of all trades were shorts play!
https://shortdata.ca/stock/SZLS.TO/