They may or may not be fried. Ballast bypass are great when you have hard conduit wired multiple fixtures. Way easier and cheaper.
I’ve installed fifty or so already.
If they’re plug in or hanging fixtures just buy new ones. I prefer those. But when you have a long row of conduit fixtures the retrofit is great.
With these led tubes you delete the ballast and Hotwire the fixture.
Then you apply the sticker that says caution no ballast.
I wonder what happens when you put an old fashioned fluorescent bulb in by mistake?