Frankly I do not fully comprehend that paragraph.
However I will be curious to see how Apple updates the MBPs. You say "Apple can manage to cram top of the line tech in such a thin and light chassis," but the iPad Pro is just a tablet doing tablet tasks. A Macbook Pro OTOH is an extremely powerful desktop-replacement-capable laptop; the equal of a Studio Max for performance. Max chip, extreme memory bandwidth, multiple TB i/o, multiple displays supported, 128 GB RAM available, etc.
I do think that the next MBP revision will be a bit thinner, but I doubt that the top of the line can be made very much lighter. MBP is the halo super-performing laptop for Apple. Apple will not cripple the MBP performance just to get "thin and light." That role (performance crippled to achieve thin and light) will continue to be for the MBA, and the MBA is fulfilling that role very well.
M6 efficiency will allow Apple to make MBPs lighter if they want to. But my guess is that Apple will not make MBPs too much lighter, instead making MBPs even more powerful and with even more battery life. Or perhaps Apple makes the MBPs lighter and introduces the rumored Ultra as the most powerful (but heavier) Mac. Or conversely makes the Ultra as the lighter MBP, still with Max chip and throughput but not positioned as desktop-replacement powerful.
Like I said, I will be curious to see. Personally my only interest in potentially upgrading from M2 Max/96 would be to get a nano-texture display and more brightness.