Does Canvas still support Structure Sensor?

No. A LiDAR-enabled iPhone Pro or iPad Pro is needed to use Canvas: LiDAR 3D Measurements. 

You can see compatible devices here. 

In the fall of 2020, we discontinued the sale of Structure Sensors for Canvas and started recommending Apple’s Pro devices with LiDAR.

Structure Sensor owners began making the switch and reported improved experiences and results. With no extra hardware and no calibration, they could simply download Canvas and start scanning. Apple LiDAR even helps Canvas scan larger spaces in a single scan, making site capture even faster. The LiDAR is less sensitive to bright light and has a greater range (5m) as well. For these and other reasons, as of August 31, 2022, we ended support of the Structure Sensor as a device for scanning with Canvas.