No, it means Snowden does not, as in individual, have useful or relevant knowledge about the spying allegations in Germany outside the NSA docs he provided.
a) because he wasn't involved in SIGINT, he cannot corroborate anything in the docs alleging the Chancellor's phone was listened upon;
b) some of the documents appear to have been FSB fakes designed to cause as much trouble between the US and Germany as possible;
I've long suspected Snowden was a tool stupid enough to be taken in by the FSB masquerading as "ethical hackers."