Like I said in my original post, iPad Pros traditionally release every 2 years with the exception of 2018. The Pros are selling well with no real competition. Apple has zero incentive to release new iPad pros one year later.
Traditionally every 2 years?
iPad Pro (12.9 inch) - September 2015
iPad Pro (9.7 inch) - March 2016
iPad Pro (10.5 inch) - June 2017
iPad Pro (12.9 inch) - June 2017
iPad Pro (11 inch) - October 2018
iPad Pro (12.9 inch) - October 2018
iPad Pro (11 inch) - March 2020
iPad Pro (12.9 inch) - March 2020
You don't have to be a data scientist to see that there is no absolutely no traditional 2 year release in the data.
Maybe you mean the big iPad pro, but even then, this data does not tell us anything about 2 years. In fact, the longest period between refreshes is the outlier at less than 2 years. The data suggests that the next refresh would be around June or July 2021, but for the reasons others have already pointed out, it may be sooner this year.
iPad Pro (12.9 inch) - September 2015
iPad Pro (12.9 inch) - June 2017 (approx 22 months later)
iPad Pro (12.9 inch) - October 2018 (approx 15 months later)
iPad Pro (12.9 inch) - March 2020 (approx 16 months later)