He’s talking about something different. The download has never been 2 TB. He’s talking about the data consumption on the Data page in the options.
I think you’re confusing things. Also, don’t listen to everything you read here. Read it and test things yourself based on how you like to fly and make up your own mind. There’s A LOT of REALLY BAD information being shared as truth.
In this case, there is zero reason to limit the data on the data page. If you want decent scenery, that’s the last thing you want to do. There’s people complaining about performance around Photogrammetry, but, everyone’s experience is different. Unless you’re having a problem, there’s no reason to change the default behavior.
Some people don’t care about the scenery and turn off the Bing Data and don’t need shared data from the internet, so, in the interest of performance on a long flight at 30,000 ft, they turn data off. But for general purpose flying, well, it’s up to you on what you want your scenery to look like.
But, I gotta repeat, there’s a ton of people here speaking “truth” who don’t have a clue what they’re talking about. All just noise to me, thank you.
Some people have talked about turning off Rolling Cache as well. That’s been pretty much debunked. Personally, I keep mine at 64GB and haven’t had an issue. With this one, there’s a balance on how to set it. Personally, I do a lot of local flying, so it’s a good idea for me to keep a cache of the local area so it’s not constantly loading. But if you do a lot of cross-country flying (cross the ocean or 4 or more hour flights), or you fly in a new completely different place every time you load MSFS, then 8 GB is likely fine, as there’s not going to be much use to the cache anyway except to give the software a chance to download ahead, assuming it even does that.