The thing is when Ps6 comes out, the PS5 pro would stop production first before the ps5 slim. Similar to how Ps4 pro's production ended before the ps4 slim. So this pro version is more like a luxury thing, and not really a practical one. Its like Sony is manufacturing this for those who want to splurge more and get the extra power for the graphics. But the Ps5 slim should work as fine anyway to ps5 games as the ps5 pro. The graphical differences won't be Night and day, and people would only see the real difference, if they both have each model.
This isn't also coinciding with a big Ps5 exclusive game. If they were launching Ps5 pro intime for the Wolverine game or a new Spider-Man, that would be good timing as some people who don't have a ps5 yet might use those new games as excuse to pay higher for a PS5 pro. While third party games for Q4 like AC Shadows and COD are available for Pc/Series X at the same time as PS5, so its not the same as ps5 timed exclusive game.