I'd never suggest YouTube for any factual information. Everything, whether it is or was alive, or materials such as plastic or metal, that are not and have not been alive, have frequencies at which they vibrate. I don't think for a second that a fabric at a given frequency would "cancel out" the frequency of a different fabric.
No, internal sutures are not made of linen.
I would love a linen quilt; I like only natural fibers. Do I think it would be a high frequency, healing quilt? Nope. I'm a whole lot more concerned about the pollution in the environment than I am about the frequency of fabrics.
There are lots of sources that discuss the reasons behind the admonition in the Bible that says fibers shouldn't be mixed.