Sony a7iii: AEL in Manual Mode

One of the Facebook groups I’m part of is Sony a7iii/a7riii setup Tips. It’s a relatively quiet group but it’s chock full of great tips for Sony’s latest cameras.
One of those tips was posted yesterday and Daniel Ockeloen, the group administrator, made a video of it which I have embedded above.

In manual mode, the AEL button can be used to maintain the exposure while you change settings. With AEL activated changing the shutter speed will change the aperture and vice versa. In effect it’s the same as going back to Aperture or Shutter Priority modes but it does allow more flexibility since AEL can be deactivated and you get full manual control again, with the same exposure.

Do other cameras do this? My Canon 6D doesn’t. Apparently Pentax cameras have a hyper-manual mode which operates in much the same way, but others have been saying for a long time that manual mode is manual mode and you don’t need auto exposure.