Yes, I keep up with all things like this.
I think it is nonsense, clutching at straws.
It is known by science that handwriting does indeed change over time.
So I reject their samples as evidence because, even if the handwriting is slightly different, so what?
Give me DNA analysis of the real and fake Sister Lucia Then I will believe there were two Sister Lucia's
The old and the "new" one always looked to me like the same person.