Video Background Hidden but still loading on mobile

I understand why videos are “hidden” on mobile, however they still seem to be loading in the background — doesn’t that void the reason for “hiding” them in the first place?

How can we disable the video being loaded in the background as well?

Here’s a screenshot of the mobile web inspector showing the video still being loaded: https://gyazo.com/2daf60c47c173b4e94f70795bd6b3181