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Why?

https://en.wikipedia.org/wiki/Tintagel#Toponymy doesn't even mention that as a theory.

I was curious so dug a little. A quick google surprisingly doesn’t really turn up reliable looking sources, but it seems like the answer is no. Most likely either Cornish or Norman French in origin, unrelated to German-derived “tin”.

It seems not. Tintagel apparently means “fort by the neck of the land” ([1]), while the etymology of tin seems to be from a proto-Germanic word for the metal.

[1] https://oldsomerset2.wordpress.com/2016/01/23/whats-in-a-nam...

[2] https://en.m.wiktionary.org/wiki/tin

A happy little accident.