Most normal people who pull into the kerb when they are dropping a person off immediately indicate they are pulling out again. Anyone with a whit of situational awareness would see the car pull in, the passenger door open, the driver indicating they are pulling out and know it is a drop off and themselves indicate they wish to pull into that space. As Mr&Mrs GG know it is only seconds.
And if I was doing a drop off, I would be scanning in my rear view mirror for an opportunity to exit back out into the traffic, and if I noticed a car slow down as if looking for a car parking space I would then indicate I was pulling off again, if I did not already have my indicator on.
It’s like knowing the car in front of you is definitely going to change lanes even before they indicate, it is all about situational awareness and reading other road users. Mr&Mrs GG did nothing wrong and they were not parked, they were just doing a drop off. I doubt they spent 20 minutes discussing how they were going to miss each other, whether MrGg was going to have a good time, did he want to be picked up again etc etc.