Call it what you will, it's related to the front steering geometry and exacerbated by summer rubber.
It's interesting you say this because just recently I experienced this same exact binding/slight clunk only while backing out of my driveway on cold mornings with Summer rubber and the wheel cranked to the right. It has only occurred a couple of times just this year, and has only happened while backing out of my driveway on cold mornings....never while driving forward, and my GTS only has 10,000 miles on it.
Normally by this time of year I would have already swapped out the Summer rubber for my Winter wheel set (same 20" sized Porsche Spyder wheels with OEM Scorpion Verde A/S tires), but since I'll be trading in my 2020 GTS next week hopefully, and since the snow up my way has held off so far, I didn't bother switching over to the Winters.
I've never felt/heard this clunk when the weather was warm on my Summer tires, nor have I experienced it in the past with my A/S tires in the colder weather.