I get it. Le is not the correct answer for a reason, but not the reason given in the lesson examples. Just because the preposition "con" is always followed by a subject pronoun is insufficient explanation. It implies that "con" was already a given, but it was not. I believe that "le" is an indirect object/pronoun and therefore not correct.
There is a note by the end of the lesson saying now that you must not use other type of pronouns with "con" and links to these pronouns (direct object and indirect object pronouns)
I hope this helps,
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