Sense does connect with Ecobee to pull historic data, which enables Sense to improve the models for Ecobee users, with side dividends for all Sense users. But the data is not directly used to update Sense, partially because the Ecobee updates arrive at 5 minute intervals (it could take up to 5 minutes for an AC bubble to appear, after the AC turns on, if Sense used Ecobee data directly).
I think the integration with Ecobee seems to work. My AC detection has gotten much better since the integration was added. Top graph is AC usage from Sense, bottom is from Ecobee. Both sources are collected and displayed in Home Assistant.
