I completely disagree with this approach.
The end goal is a thick healthy lawn, right?
If the grass that is there is now is desirable, and it sounds like it is, why mow it lower and stress it out. Mowing lower is not needed for a successful aeration and seeding. Its like your taking 2 steps back to go 3 forward.
We aerate and seed over 400 home lawns each fall. I say this to show I have vast experience in this, not to brag.
In my opinion the best overall mowing practice is to keep right on mowing high, don't skip a beat. The only time I may skip a mowing is if it gets to wet for a week or so. Maybe cut down on the need to stripe for a few weeks to eliminate some of the 180 degree turns but keep right on mowing every week and never lower the heights.
The way I always look at it my job is to try to grow good roots. If we have good long roots the byproduct is a healthy lawn. The quickest way to shorten the root system is by dropping the mowing heights. Again, the end goal is a thick healthy lawn.
If on the other hand all you are trying to do is target for the aeration and seeding go ahead and scalp away... I would never take that approach.
Hope this gives some food for thought!
The idea behind lowering the height of cut is to allow sunshine in so seeds can germinate. Part of the reason we mow high to begin with is to shade out the soil and prevent weed germination, so in turn this will inhibit new seed germination. Also bear in mind my approach is geared towards giving the new seed the best chance of gaining the majority, although I've never seen mature grass yet that hasn't recovered from the temporary growth stunting from cutting it short.
I agree that a thick healthy lawn is the end goal.
And yes thank you for the food for thought.