In my opinion, such an opinion cannot be generalized to all jobs. Because we all know that work is not all in an office or in a factory building. But at home you can also do a job and of course it will be the same. Because the work has many branches and many types. From work that is specifically located in an office, to work that can be done at home.
So I think the research is not complex and not comprehensive in all fields of work.

Then not only that, sometimes there are typical people who are more comfortable working at home compared to working outside the home such as in a factory or office. So if you look at this factor, the research is clearly refuted. Maybe for people who are used to working in an office, it can indeed reduce their work performance a little, but maybe that will only happen in a few days, and if you have adapted your work performance will definitely be normal.

For example, when the Covid 19 outbreak hit a few years ago, at that time due to social distancing rules and those related to the Covid 19 outbreak, many companies made all of their employees work from home. And this went on for quite a while, but even though the workers/employees did their work at home, for the majority, I'm sure they did a very good job.

Because the logic is like this, these employees definitely need money, which they get from their jobs, so automatically these employees will do their best so they don't get fired from their company.