TPMS light confusion

Hi everyone!

I have a confusion about the TPMS light.

Two TPMS sensors have gone on my wife's 2006 Prius - the TPMS light flashed on start then eventually settled on solid.

I bought 4 Denso "OEM fit" sensors from RockAuto hoping to save a bit of money (DENSO 5500103) and have booked in at a local shop to have them fitted. They seemed a little confused about whether they would need to "program" them or not (they are pre-programmed I believe).

To save some time and confusion, I decided to add the new sensor IDs to the car via TechStream before the new sensors are fitted.

After doing this, the TPMS light has turned off. The sensors are still in the box, not installed. I drove round for 15 or so minutes, and the light did not come back on.

I'm very confused about this. I would have thought that with the new sensor IDs on the car, the TPMS light would again be on since they can't be showing any pressure.

Have I misunderstood something about this procedure?

Bonus question: Anyone familiar with whether these particular sensors need to be "activated", e.g. tpms tool trigger, rapid deflate/inflate cycle?