It doesn't. Anyone is able to redistribute these Redis Modules under the same license.
Yiftech commented that the reason for making the switch was that "AGPL does not prevent cloud providers (such as AWS) from building managed services from these modules". The entire reason for making the switch to licensing the modules under the new license is that the Free Redistribution aspect of AGPL and other open source licenses allows cloud providers to use the software in a way that Redis labs doesn't like.
You're probably looking for #6:
> 6. No Discrimination Against Fields of Endeavor
The license must not restrict anyone from making use of the program in a specific field of endeavor. For example, it may not restrict the program from being used in a business, or from being used for genetic research. ... or in this case, "offering Redis with extension X as a Service"