Members with a gold trophy by their name can entirely delete a posted comment.
Whoever posted the reply your referring to must have been a "contributing member", thus Gold Trophy.
I like that feature, somtimes I "open mouth and insert foot".
Thanks for clarifying your inquiry as to Engine Builders, it was confusing.
For those "senior moments" you may want to contribute at the next annual fund raiser and pick yourself up a Gold Trophy.
Ernie