The parse is failing because of the quotation marks. From the manual: "Fields that contain a special character (comma, newline, or double quote), must be enclosed in double quotes."

Change your initialization to:

my $csv = Text::CSV_XS->new( {
   'allow_loose_quotes' => 1,
} );
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and it should parse.

Resetting 'sep_char' to ':' won't work, because that will make CSV split on ':' characters, and you want it to split on commas.

I suspect that for what you're doing, you're not actually getting any value from Text::CSV_XS. I think you'd do better just to use split(), but that's up to you.