Witch is followed by this:
"but you don’t have to settle for
that limit forever. You can go through a process called
Initiation(p. 324) that can enhance your abilities. The
maximum value of your Magic Attribute (if you have
one) is 6 + your Initiation level"
And even more annoyingly Bull flat out denied that it is in need of errata
"but you don’t have to settle for
that limit forever. You can go through a process called
Initiation(p. 324) that can enhance your abilities. The
maximum value of your Magic Attribute (if you have
one) is 6 + your Initiation level"
And even more annoyingly Bull flat out denied that it is in need of errata

Of course it doesn't. The rule you quoted also assumes no essence loss due to cyberware etc. It's a general rule, that gets overridden by specific rules.