If a video has been restricted by YouTube to certain ages or for content reasons, it’s completely unplayable in Orion RC or Testflight.
I’ve disabled my YouTube extensions to confirm they’re not interfering.
Here’s how the video looks in Vivaldi, tapping or clicking on “I understand and wish to proceed” then plays the video.

Here’s how the video looks in Orion Testflight (it looks the same in RC). Pressing the play button does nothing. I haven’t found a way to get the video playing.

.
1.4.14 (4) Testflight.
Tahoe (26)
26