That’s what I thought, which is why it was disappointing in more ways than one. You’ve even reported in the past that they said they’d add it to Battery Cam Pro, and the Wishlist topic where that’s posted is still marked as Wishlist > Maybe Later. 
With a solar-powered camera that can be expected to recharge itself during the day, that should be an ideal platform for construction sites, weather events, and all kinds of potential time lapse scenarios where a camera can temporarily “wake up” and snap a photo at a specified interval. This is not continuous recording, and I sorta get why they’re not allowing that when a Solar Cam Pan is being powered only by the battery and solar panel, but if they can allow a user to select Continuous microSD recording when it’s connected to an AC power adapter, then at least in that situation it’s no longer strictly a “battery-powered camera”, and it should have a Timelapse feature available.
Really, though, time lapse recording should be possible even on solar/battery power, and the app should be able to give the user sufficient warnings if a capture interval and/or time lapse duration is likely to be problematic when powered that way.
Wyze gave the wrong answer with this one. 