I’m not sure what the “it” is that you’re referring to. I don’t believe Thread was listed as a switch feature on the product listing in the store; however, there has been extensive discussion of it here in the community. Inovelli’s plan has been to ultimately provide an upgrade path for the Blue 2in1 to be upgraded to thread. Upgraded, not out of the box with the currently shipping switches.
The currently shipping switches and until Inovelli says otherwise, contain a MG21 chip. The plan as laid out by Inovelli is to provide an upgrade path for that switch to Thread by updating via a cable attached to the switch. That is the stated plan; however, it is still in the works and yet currently a thing.
Down the road, the plan is for the switches to be built with a MG24 chip, which will allow you to upgrade to Thread OTA, so a cable won’t be needed. That’s the stated plan, however at this time Inovelli hasn’t said with certainty (AFAIK) when the switches will start shipping with the MG24. So right now, that’s not a thing either.
But according to Inovelli, both are coming.