If you just buy one and "get it over with" What is learned form that exercise? What is learned by not following those instructions?As Brian stated earlier, the 5G map doesn't tell the whole story. In our case the problem is the usage of a particular part of 5G (Band N77 from 3700 to 3800). There are numerous other bands that 5G can use besides N77 that won't interfere with satellite reception.
However, the only real test is to try an unfiltered LNBF and see if it works. If it doesn't you will have to buy another LNBF (a filtered one). If it was me, I would just buy a filtered LNBF and get it over with.