As stated in the other thread - many others, including myself, have successfully used Garmin products with ANT+ equipped Giant bikes.
Unfortunately, I can only confirm that it works with a model 830, and others have confirmed about the 530.
There is an APP called
"Ebike Field" and the author lists the 130 as compatible.
The issue will be your bike controller - if it is ANT+, it should work.
With a MY21, I see no reason why it wouldn't.
As for calories - not sure how accurate these devices are.
I suspect "not very accurate at all..." without measuring heartbeat.
Even though there's a lot of data points available (speed, ascent, cadence, personal metrics such as weight etc..) - I just can't see it myself.
If that particular measure is super important to you, I don't think a $140 device is going to get that for you. But, those other values are important too, and are absolutely worth it in my opinion.
Disclosure - I bought the 830 due to poor vision.
The 130 as just too small to read and I still struggle with the 830 too.
Hopefully after the soon to be scheduled Cataract surgery, I can read all my screens with my riding glasses.
Good luck - hopefully the place that's offering the $140 price also offers a reasonable return policy.
If they do - no brainer...