Car tire recall

my son drove my SS and noticed this when getting gas. I thought he may have run over something that sliced the tire. When he got home I checked it out. The section to the left of the slice is "hollow" it can be pushed in. I am guessing there was so.e type of air bubble formed during manufacturing.

(Yes I know the tire is slick beyond wear marks. I drive it like I stole it. 🤪 )