Think there is a 10A limit, rather than 13A, but I’m sitting next to a plug switch not connected to anything just used as a Zigbee repeater!
There are many threads on this forum about IKEA’s remotes - most are frustrated users saying “this must work”, or finding the kit breaks or dies a day later with a dead CR2032 and looses pairing. Thankfully, the 5-button version now seems to work with for ZHA and a good mesh with a firmware update.
The “monster 5-button thread” contains nuggets such as working firmware versions, and how to enable ZHA firmware updates for IKEA kit - oh, and much fustration sadly.