TBNN is known for it's Reformed-flavored humor. I suspect the ESV was chosen because the ESV is hugely popular among "New Calvinist" types, in no small part to Sproul's Reformation Study Bible.
I have tended to prefer the NASB, but I got into the ESV for the reason you cite-the Reformation Study Bible.
“Why the ESV?”
means: why does it even exist?
It’s unnecessary and wasteful.
The English speaking world DID NOT NEED IT, when Bible translation groups desperately need resources to finish translating God’s word in the thousands of distinct languages.
The existence of the ESV is vain and narcissistic, in my opinion.