From the webpage..
"Most recently we have developed a process to remove postage stamps from old albums and letters."
Yes, it's called soaking, and typically involves … wait for it.... soaking the stuff in water. OR if you want to save the letter but sell the stamp (sometimes a foolish move as they can be worth far more together) Some humidity. Like a closed plastic box and a bit of very hot water.
And it's been accepted practice since probably 1840-41, when the first stamps were sold.
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