neorol said:
"Some examples of changes which could lower your score:
you no longer have a valid job offer
you no longer have a provincial nomination
your language test scores have expired, or you re-took them and they are lower"
source: http://www.cic.gc.ca/english/immigrate/skilled/invitations.asp
You taking this out of the context.
What you see here is just
examples of changes which could lower your score.
Language requirements are outlined here:
http://www.cic.gc.ca/english/immigrate/skilled/language.asp
How long language test results are valid for
Your test results must be less than two years old when you submit your application for permanent residence.
If you have been invited to apply, check that your language test results will still be valid when you plan to apply for permanent residence. If you haven’t been invited, you may want to make sure your results are valid for the rest of the time you will be in the pool.
If your results will expire before you can apply, you should:
be tested again,
apply before your test results expire, or
decline the invitation and go back into the pool to be considered in the future.
If you apply for permanent residence with language test results that have expired, we will refuse your application.
You can use your test results to find your CLB level.
If there were such a requirement (recent test result), they would have mentioned it.