“Av is 11 אלול is 12 & תשרי is 1, how does that grab you? How does that shock you?”
It shocks me that a ostensibly frum person can no so little about the Jewish calendar and possibly be over an aseh
“Hachodesh hazeh lachem roch chadashim” Nisan is the first month. Av is the fifth (“Tzom hachamishi”) not the 11th. Tishrei is not the first month, calling it the first month is at best wrong, and possibly a bitel aseh (according to the Ramban)