I’m not going to agree with this non-article that it’s always streaming that much data.
What article are you talking about? The one in the OP doesn’t say that.
Meanwhile, scattered reports of MS Flight Sim 2020’s bandwidth consumption point toward a more conservative ~100 Mb/s in densely populated photogrammetry areas, such as major cities. Usage in lighter areas could dip as low as 10 Mb/s, though the official Microsoft bandwidth recommendation for that game was 50 Mb/s.