There are groups that assume fossil fuels will still continue in some capacity regardless for some time, so if technology can be developed (without generating vast amounts of emissions in the process) to reduce undesired side effects of fossil fuels continued use, it's worth exploring. It may also become useful on the global stage where certain states don't seem to care at all about developing clean energy (e.g. China). If you do develop an effective cheap way to sequester carbon emissions for fossil fuels, you have a much better chance at persuading China to use and adopt it than telling them to shutdown all their coal fire power plants.
For a practical example, the government of the UK likes to claim that they are on track to be "zero emissions"[0] -- great effort on their part. However, here all the imported manufactured products that definitely are not "zero emissions" aren't counted. All these emissions were exported to China, and then they have the gall to complain that China's emissions are too high.
[0] https://www.carbonbrief.org/analysis-uk-is-now-halfway-to-me...
Meanwhile, on that page that you are quoting, all of those projects are on the ballpark of a million tons (a billion kg) per year. With luck, all of those projects put together (by the most ""climate responsible"" oil company nonetheless), each year would cover 15 days of Shell's carbon extraction. And that's without taking into account the fact that these projects have emissions of their own, which are definitely not taken into account for these totals.
Carbon sequestration is an interesting effort for sure, but the only use it has is give oil companies excuses for their existence.
[0] http://priceofoil.org/2019/05/20/shell-emissions-still-going... [1] https://www.epa.gov/energy/greenhouse-gases-equivalencies-ca...