Yes because even though Manjaro is a rolling-release distribution most if not all packages go through a testing period in the unstable and testing branches. The normal version of linux516 is available in unstable branch:
OK guys, I just put Garuda on a different, spare SSD. Just wanted to try it out. I noticed something in there that allowed you to get the latest stuff, but not change your branch. It’s a repository called Chaotic AUR. I can pull the new kernel out of there, without having the system overwrite everything.
Its just the AUR, with a few things added, and automatically (blindly!) compiled and served as if it is a regular repository. IT IS NOT. Those packages are not vetted, inspected, etc. All normal precautions of using the AUR would apply … except its precompiled and there is no pkgbuild to inspect or augment.
None of that is the same as ‘getting packages early without changing branches’ … its simply using the AUR more dangerously.
And that danger factor multiplies exponentially when, such as in cases like yours, the user has no idea what they are actually using, how, or the the implications of it.
I should also state … that the AUR, and to an even greater extent, 3rd party repositories of any kind, are unsupported on Manjaro. Use at your own risk.