I would ask the site directly email them. On first impression the Taylor ones would be handwritten and signed but the others may be a copy of handwritten lyrics that has then been signed.
Just ask the site itself to confirm that "each item is indviually handwritten and then signed by the artist"
In 99 percent of cases the autographs are authentic when they come directly from the singers website im sure if you buy any of these you will be getting authentic autographs.
My only concern would be that they may be signing a print of there handwritten lyrics Like write the lyrics once make 100 copies then sign the copies like an artist does with limited edition art prints.
Just ask the site directly to confirm but I think you should be getting the real deal buying from your linked sites above
I would highly doubt that any artist is "writing" lyrics on a page. I would hazard a guess that 99.9% of the time, it's a pre-printed sheet with the lyrics on them, then signed by the artist. They hate signing their name, you think they want to write out lyrics in addition to a sig? lol..