There really are a variety of expansion tanks and silica bags, and it might be that @benterrier's bag isn't the same as the one in the video.
I mean, they all look pretty much the same.
But back to my original question: "What is the problem you're trying to solve?"
I submit that the problem is worrying about the silica bag splitting.
In which case, the least worry and fewest variables option is to have the expansion tank changed to a non-silica tank, and replace your coolant with G12evo. That's the problem sorted forever.
Yeah, I've read that too. Seems reasonable, but I don't know for sure that whatever makes the silica bags split isn't an issue for the double-walled expansion bottles.
Maybe it's because the silica gets trapped in the double-wall construction of the expansion tank when the bags split.
One of the guys at work was telling me about his 2015 Audi A3 that had had the dreaded "Like half my heating in the car don't work." issue. He had the heater matrix replaced under warranty, but then the problem later returned and he had to resolve it at his own cost. He knew his problems were caused by some sort of silica bag issue, but wasn't really interested in the precise cause of the problem or the preventative solution. (For all I know, he now has a new expansion tank with a new silica bag in.)
My point is, that people who are both aware of the issue and look into the cause and preventative options for mitigating the risk, are a tiny subset of VAG vehicle owners, so collecting data on the issue is difficult. I would guess the safest silica option is the cartridge type silica container, and even they fail. https://forums.ross-tech.com/index.php?threads/8529/
Once you're aware of the silica bag problem, for people like me, it's always going to be a little niggling worry in the back of my mind, and I have more than enough of those already. So once I understood the issue, I fished my bag out and replaced the coolant. I understand the "Out of sight, out of mind." perspective with double-walled expansion tanks means fishing the bag out isn't an option. (It can be done, but there's a good chance you'll split the flipping thing trying to fish it out.)
The easiest option is to do nowt. There's a fair chance you'll be alright and won't have a problem.
The safest option is to remove the silica bag from the expansion tank (or replace the tank if you can't) and replace all the coolant with G12evo.
As Cilla might have said on Blind Date: "Will you go for contestant number one, who's free and easy but offers no guarantees, or contestant number 2, who'll give you peace of mind, at a price? The choice...is yours!"
You beat me to it while I was busy writing my latest "War and Peace" post.