I asked IRCC on Twitter about that, because it's 25 months if you applied already and 15-19 if you haven't yet applied.
So what happens if you apply? Is it 25 months or 15-19 months?
They said:
"Most processing times listed on our website are historical, which means they’re measured based on how long it took to process 80% of applications in the past. For some permanent residence applicants who haven’t applied yet, processing times are projected, which means they’re measured based on the current number of applications waiting to be processed and how quickly we expect to process 80% of them. Although COVID-19 has caused some slowdowns in our processing centres, we are working to process all applications within our service standards as best we can."
Mind you they put disclaimers on their website everywhere that processing times can be impacted for any reason - so if they're processing emergency Afghan and Ukranian applications then, really, it's in fate's hands. Still, I'd keep messaging them every month if you don't hear back.