I suspect whomever wrote that hasn't actually read the trademark policies in detail, or conferred with lawyers about it. Neither Python's nor Perl's agreements explicitly cover the case in detail, but Perl does mention this:

> Licensed redistributors of Perl code are permitted by their licenses to use the Perl logo in connection with their distribution services, on product packaging, and in promotional materials.

IANAL, but that text would especially suggest to me that you would have no right to use the trademark even to distribute an unmodified binary of Perl without approval.

I suspect the real reason is Debian and Mozilla had a very public, well-known spat over licensing, and Python and Perl have not had very public, well-known spats with anybody.