Keep in mind he's been cellaring since the early 1980's, so he's got much more experience with this than anyone opining on this thread.
That is about when I started. Prompted by people I met a shows like Indiana Briar Friars who were already doing it. Blends were already changing/disappearing. It didn’t take a genius to listen and learn.
There are several ways to keep tobacco in smokeable condition. It will change over time. You might like the changes, you might not. Another smoker storing the same tobacco the same way at the same time might disagree with your opinion of whether the changes are an improvement or not.
As direct a quote as I can give from Dan Jenkins: “ A man can travel far and wide, all the way from shame to glory and back again, but he ain’t going to find nothing in this world that is dead solid perfect”
If you are convinced that storage in Mason Jars is the only way to go, I think
@cosmicfolklore has posted several things in various threads that might give you pause.
Cellaring makes sense to me because tobacco won’t be any cheaper, blend recipes and raw ingredient supply chains change, blends get discontinued, and it may be that some day in the future we have to live with only face to face sales.
Except for the desire to preserve tins in pristine condition for sale down the road, I can’t think of a single reason why I need to be concerned about surface rust on a tin inside a heat sealed 7 mil Mylar bag. I hope, and I don’t think it is entirely unreasonable, to be alive and smoking a pipe in 5 years. 10? My executor will have had to deal with any rust issues by then.