Thanks for sharing this estimation. However if we projected it towards the past, it wouldn't match the previous release date:
74% = 37 weeks ~= end of January 2021, while the actual release was in July 11th. This means that 2% is not, or it has not always been, the actual update rate. The update rate strongly depends on multiple factors like real life events, how tough it is to create content for a specific scene, the task itself (rendering vs writing vs ...), so very likely the current phase just seems slower because of one or multiple factors and it will get quicker with time. Or perhaps slower