REQUIRED to run your dishwasher every day?

This is semi-related I guess, since I am a FTHB.

My dad built and purchased a house in 2021. It's a 4/3, so a pretty large home. He has been told multiple times that he has to run the dishwasher every night, or his house will flood. He just paid $500 for a plumber to come unclog his system because I was house sitting for 3 days and only ran the dishwasher once on Saturday. Every single toilet and shower in the house backed up this morning. Apparently, the plumbing system depends on the dishwasher to act as a vacuum?

I have been alive for 34 years, and living on my own for almost 15 years. I have never heard of this. My current house, which was also built in 2021, does not function this way.

Has anyone else dealt with this? Maybe it's a PSA.