so please a last 16" with Intel!
I'm think all the lines are moving to ARM in 2021. Apple will keep selling the current Intel models alongside them until the end of 2022. Dropping some Intel lines in 2021. That's likely what they meant by the transition taking until 2022. Then the 2023 macOS (11.3, 14, XIV) will be the last to support Intel.
I also think the only Intel models which may possibly get another Intel update are the MBP 16 and iMac 27. But that is doubtful. Beyond maybe a GPU bump or base config bump and upgrade price adjustment using the same gen parts as they currently use.