Internet connections in Germany are really hit or miss. Some works extraordinary well and some next to not at all. I'm kinda lucky to have a fairly good one.
It's much the same in the States. I pay $70 a month for 500 Mbps. I live in a suburb connected to Oklahoma's capitol city. My brother lives in the sticks with no interstate highways within a one hour's drive. He pays $120 a month for 40 Mbps. This development comes in the wake of dropping his old ISP that provided plans up to 25 Mbps for the same price and required you to sign up for a landline to receive internet services. We grew up there, and when we were kids in 2009, our parents had 256 kbps service. And that was the most they could get. The place is also a dead zone for cell service unless you have Verizon.
I don’t think that they meant „moving“ as in relocating your life somewhere else. The person who wrote that message probably assumed that you had bad mobile internet at that time and suggested you move your ass up a hill for better mobile Internet.
And yeah - mobile Internet is really bad and expensive in Germany in general.
They mean take your cell phone/tablet/laptop and walk to another room so you get stronger WiFi, not change your address, as can be seen by the context in the next statement "or try with a wired connection"