Maybe you're right... Toyota may be trying to downplay the fob just to discontinue the feature. People have complained about the short range of the fob for years. You could have added Toyota OEM remote start through some plug and play components (no splicing or cutting) for years, such as with the 3rd Gen Highlander and many other models. However, it worked in conjunction with the keyless entry fob and was limited to that fob's range. I don't believe they sold many of those systems because the range is just too short for why many people buy remote start. After all, what good does it do to have to get within maybe 100 feet of the car in order to start it? That's OK if the car is in your driveway or parked in front of your house and you're in the house, but it often doesn't make much sense if you're at work and where you're parked isn't real close to your desk or even the building you're in. Aftermarket remote start systems have continued to be very popular as a result, for either longer range fobs or their support for cellular-based solutions. (Anything cellular means annual fee, of course.)
My car is garage-kept, so I don't have any use for remote start at home. At work, forget any kind of fob solution - the car is too far away. So I welcome the OEM cellular data-based remote start (Remote Connect), and I'll pay the annual fee.
Anyway, for now, 2020 Highlander offers both the fob and Remote Connect. The fob works, no problem. It's just that how long the fob works may be artificially limited to a certain number of years unless you start paying for Remote Connect down the road. And who knows - maybe that will change. When Entune first came out, that was intended to have free app updates for only three years, and then they actually envisioned people paying for it! Well, the Entune Apps are pretty useless in reality, and were mostly removed in Entune 3.0. When the first Entune systems were on the road for almost three years, Toyota changed course and decided Entune Apps would be free forever. Since remote start from the fob should have nothing to do with online services, maybe they'll have an easy software patch to extend its life.