I am really sorry that there was not enough information available on the grove website whether these sensors worked or not with the GrovePi+. Usually all the information about the supported sensors is avialble here. We usually ask people to post about sensors that are not mentioned there on the forums because there are a lot of sensors which we have not written libraries yet and might work with the GrovePi.
Right now these temperature sensors are not supported directly with the GrovePi.
However, we had received these sensors from Seeed which manufactures them and I took a bit of time to test them with the GrovePi. I was not able to get it running directly with the GrovePi but was able to get it working with the Pi. Getting it to work with the GrovePi directly might be a bit difficult though we’ll work on it in the near future.
If you want to get this sensor to work with the Raspberry Pi, you can try out this tutorial. Though the connections would be a bit different. If you look closer to the Grove connector at the end, you’ll see that only 3 metal tabs of the 4 slots at the end are. The one connector which is singled is the Signal line and the other two are Ground and 3.3V. (refer to the picture here)
You should connect the GND and 3.3V to the GND and 3.3V pins on the raspberry pi and the signal to Pin7 or BCM4 on the Pi header (https://pinout.xyz/pinout/pin7_gpio4).
Once it is connected, power the Pi, and try running the commands from the Add OneWire support in the section of the tutorial linked above.
Do let us know if it works for you. We’ll test it on the GrovePi and will keep you posted about that.