OK, so here is the latest GSV view dated April 2022 : -
https://maps.app.goo.gl/rqKBtof6uM2mkGDo9As one can see it is a single bay not subdivided. So anybody then could park in front of those gates because they would be in a marked parking bay.
However, if one looks at your first photo, (IMG 2626), one can see a clearly marked bay for a single vehicle, and the markings adjacent to the gates are painted out by black paint, but that has partly worn away. Then looking at IMG 2629, the new bay markings are also clearly shown, and again the markings adjacent to the gates are painted out but partly worn away.
This is clearly the work of the council, and a rather botched job has been done, in that the white markings have merely been painted over, rather than burnt off. Over time, the black paint has worn off, thus exposing the markings once again.
So you could take them to London Tribunals on the basis that you parked in a marked bay. The council must then prove that the bay was re-arranged to allow the dropped kerb to remain free.