On reading your post, and listening to this lesson, the 1st plus does have a soft "s" and the 2nd one is silent. After listening to Forvo and Reverso, I noted that they pronounced the "s" in the 1st plus with a Z sound. Is this regional? Can you clarify please.
The first -s of
de plus en plus
is a -z sound and it is a liaison between the -s and en.
The second one is silent.
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