Leaking tire plug repair

True, as long as you don't tell someone else it is safe to do it. The plug you talk about does not properly seal the liner. It is the liner that must be airtight.
Well, I've done thousands like that over the years. Professionally with a huge local tire chain. I will say I've not been in it in quite some time, so I'm sure there've been enough sleazebag attorneys that have changed laws regarding it. I do completely agree 100% the type repair you speak about is the best.....well......second best. The best would be to replace the tire.