Here's a short post describing these estimates, with some more charts.

The data is from IPUM-USA and IPUMS-CPS. Code for calculating the estimates is here.

How does this account for hybrid positions?

I think it will tend to count them as teleworking. The question text for the telework due to COVID-19 part is:

>At any time in the LAST 4 WEEKS, did (you/name) telework or work at home for pay BECAUSE OF THE CORONAVIRUS PANDEMIC?

For the 2019 baseline it is likely to be less inclusive, as the question is:

>How did this person usually get to work LAST WEEK?

NGL, I kind of hate these stacked bars. It really doesn't feel like it makes sense to use here. (Or am I misinterpreting the display...?) Also, what are the percentages for the baselines? Literally none of those are labeled.

Edit: looks like I'm indeed misinterpreting them. They aren't stacked, they're overlapping. The display could certainly be more clear. My point stands on the "baseline" values needing labels, though.

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Where are the labels to distinguish the different colors?

They are in the top chart for educational services, it's just a little sneaky and takes some time to parse.

Nice work to OP with mimicking Economist styling (to my eyes)

Hybrid is a broad definition.

3-days in office? 1-day?

How is your shift? 5/2, 2/2, 1/3?

But it could be accounted, yeah.