You conveniently omitted the rest of my post
GIRM
In the dioceses of the United States of America, they should kneel beginning after the singing or recitation of the Sanctus until after the Amen of the Eucharistic Prayer, except when prevented on occasion by reasons of health, lack of space, the large number of people present, or some other good reason. Those who do not kneel ought to make a profound bow when the priest genuflects after the consecration. The faithful kneel after the Agnus Dei unless the Diocesan Bishop determines otherwise.53
(emphesis mine)
It is not up to you to correct a priest or Bishop, or decide what is a good reason. You are also told what to do if you determine there is an abuse, and it certainly is not to correct a celebrant.
Lux