It does not need to be a slippery slope though.

I would expect companies to count plane emissions when their employees go on business trips, but not on holidays.

I would also expect companies to count emissions produced by their employees when they work remotely, which should be a part of the total emissions of their home.

Sure, they may not be able to get an exact number, and it will be lots of estimates, but it does not mean that we should accept some approximate statement such as "We're trying our best"