First, let me say, I am in no way defending bringing up retention rate in a parents online forum. At this point it is not an advertising tool. Most universities are struggling financially... I mean really struggling. Cuts will not be to the fat, they will be deep and students will suffer, period. Programs & services will go, along with the staff that are terminated. State universities like Madison rely on tuition as well as government money. You can imagine that both have been gutted. I think he brought it up because faculty everywhere are desperate to have students enroll. That is a mandate from the administration, not a choice. You caught him off guard and he didn't have a response because he has been told his job is to get students back... not take a year off.
Many faculty are very upset at being called back into the classroom, especially with spikes among younger people many of whom, for whatever reason, are not conforming to masks or social distancing. I know I not only have mask and gloves ready but have bought a plastic shield to wear in the classroom.
Honestly you can't judge online learning by last semester. Faculty planned courses for in person instruction. Having to change to online in the middle of the semester was very difficult... not just for students, but faculty, many of whom did the best they could. The fall will hopefully be better. I know at my institution we are planning for students to come back to campus, but all faculty have been told to construct courses so they can be transitioned to online if necessary. Over the summer we have had lots of extra training on the resources that make for a good online experience.
Colleges and universities will struggle for a long, long time. It will impact students. This is a financial crisis for lots of people and businesses... that includes whatever school your student is attending.