I have no problem with him bowing instead of genuflecting (I'm in my 60s with bad knees and if I genuflected someone would have to help me get back up - I bow and make the sign of the cross). I do take issue with the Sacrament of the Altar being a "humble meal" though...
Usually, popes have plenty of healthy men ready to assist them in knoeeling and getting back up on their feet.
Many times, I have seen altar boys assist an elderly priest in genuflecting at the Consecration or kneeling during Benediction. I have no problems with handicapped elderly standing at the altar rail, nor does my priest.
Pope Francis kneeling on a prie dieu.
The image dates to 2015 on a blog post entitled: Pope Francis Comes Out in Favor of Genuflecting. The blogger cites Francis' comment on kneeling "How I wish...that Christians could kneel in veneration when a poor person enters the church." but notes that he wasn't talking about genuflecting to Christ. He raises some good questions.