From a brand new assist doc on TP-Link’s web site by way of Reddit:
Due to modifications in our roadmap, the Kasa Smart Plug Mini (HS105) good plug won’t supply assist for Apple HomeKit. Despite the change in route for this particular SKU, our workforce is dedicated to the event of revolutionary good residence options that may proceed to please our clients across the globe.
TP-Link initially deliberate so as to add HomeKit assist to the good plug in early 2019, a promise that it has now damaged.
Fortunately, HomeKit-enabled good plugs are fairly widespread, with all kinds of choices obtainable from manufacturers similar to Eve, iDevices, iHome, and Wemo. They can be utilized to conveniently activate and off TVs, lamps, espresso machines, and different family objects with an iPhone, iPad, Mac, or Apple Watch.
https://www.macrumors.com/2019/08/12/tp-link-kasa-smart-plug-mini-wont-get-homekit/