There's nothing about ban evasion in these rules. Is it intentional? Or everybody overlooked it?

Isn't that kind of self explanatory? If you escape prison and they catch you, they put you in for a longer amount of time.
I agree it is, but sometimes it's useful to point to a specific written rule. You might
recall that my motivation to the spanish translation was to be able to tell a troll what the rules were. Ok, now that troll has been permabanned but he keeps on creating new accounts, and there's no specific written rule to point to. Self-explanatory and all that, yes, but these people have a
err
different mind set

.
Good point, added rule 25 with an explanation:
25. Ban evasion (creating new accounts when the old one is banned) is not allowed.[e]
25. If you get banned (temporary or permanently) and create a new account to continue posting / sending PMs, it's considered ban evasion. The only exception is creating a thread in Meta about your ban.