No-coverage answer
There is no information in the Taygetan contact material to answer this question. La Palma and the Canary Islands are not mentioned in any transcript. While the material discusses Atlantis extensively — placing its main stronghold in Iraq and its bulk civilisation on the now-submerged continent of Appalachia (under the North Atlantic) — it does not address whether any specific modern island chains are geological remnants of that civilisation. The Canary Islands' possible connection to Atlantis, a popular topic in alternative history circles, is not discussed.
For the Taygetan account of Atlantis, see the answer to "What happened to Atlantis and Lemuria?"
Sources: None. Searched all 834+ transcripts and enhanced topic index. No coverage found.