Does U+27E1 really mean “never” rather than “sometimes”?

[Ivan Panchenko]

The white concave-sided diamond (⟡) has the informative alias “never
(modal operator)”. I would have expected it to mean the opposite
because U+25C7 (◇, white diamond) is used for possibility rather than
impossibility. Two sources that support my view:

https://books.google.com/books?id=41VYDwAAQBAJ&pg=PA211
https://www.mdpi.com/2079-9292/8/10/1163

The informative alias of U+27E2 and that of U+27E3 might also need to
be corrected.

Best regards
Ivan