I read the entire article. It left me with a lot of questions. 42% seems awful high and is it sustainable. There's a lot of shortages and disruptions right now. It would be sad to believe that only 26% of workers are 'essential', must be a lot of waste out there.
Assuming I am reading the article correctly, and allowing for rounding, the following adds up to 100%.
42% - Essential and working from home. (If they were not essential why would they be working from home?)
33% - Not working
26% - Essential service workers who are working but can only work "...on their business premises."
The company I recently retired from, a health insurance/hospital system, sent everyone whose job allowed them to work from home, home. If that meant providing them with a laptop, or even a desktop, they got one. Initially, some WFH people had to work second or third shift since there was not sufficient remote access capacity (VPN) for everyone to work first shift. Once capacity was added, everyone could work first shift. Note this included conference calls and video conferencing. As MossRoad indicated, this was possible because the remote access had been in place for decades, it only had to be expanded.
People were then grouped into; (1) Full Time WFH (2) Full Time in the Office (3) Had to be in the office one or two days / week. Excluding the hospital system, 80% of the work force could WFH either full or part time.
The last I heard, people would not be back in the office earlier than July, 2021 and, odds were, people categorized as Full Time WFH, i.e., they had no business reason to be back in the office, would permanently work from home.
A small group was formed to identify the issues, e.g., the township/cities where we have offices received tax revenue from every employee who worked there. What entity receives this tax revenue now that 1,000s of people were no longer working in that township/city? How will payroll systems need to be changed to support this?
Finally, productivity went up because many people were actually working more than 8 hours a day and not because they had to. Grab a sandwich from the kitchen instead of going out to eat. Shorter walk to the coffee maker. No chats in the halls. Obviously, some of these also represent a potential problem. Lots of information and business knowledge is exchanged during 'chats in the hall' or someone dropping by your office/cube.
The pandemic has resulted in a huge workforce experiment. I imagine many companies are evaluating the ongoing need to maintain office space and real estate when a good percentage of their workforce is WFH.