The use of pedantry in response to someone's preceeding pedantic statement is termed sarcasm and whilst often unappreciated its use in this instance makes much the same point that you make. And yes the use of commas to separate an explanatory sub-clause within a sentence is grammatically accurate.
The use of pedantry in response to someone's preceeding pedantic statement is termed sarcasm and whilst often unappreciated its use in this instance makes much the same point that you make. And yes the use of commas to separate an explanatory sub-clause within a sentence is grammatically accurate.