My 2 cents: Put a sticky string (or two) into the hole with some glue and ride it.
I always wondered about these plugs until I got a BMW with tire pressure monitors. I plugged a good size hole in the center tread of a new tire (it took 3 strings to fill it) and then rode carefully watching the pressure as I rode. Eventually I got to trusting the repair fully, and rode in my normal fashion and ended up using the tire until it was worn out- never any problems.
When I took the tire off and looked inside I found the strings bonded by heat to the inside of the tire- no way were they ever going to come out and even if they were to leak, it would not be a catastrophic failure.
Long story short........plug it and ride.
...............shu
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