If you watch the video, that's a highly specific tool, which almost certainly only applies to Drayton TRVs.
Most TRVs, especially mine, are unknown / generic / old and therefore require the lockshields to be used for balancing as per the following links:
Are some of the radiators in your home taking longer to heat up than others? Discover when and how to balance radiators in our useful step-by-step guide.
www.homeserve.com
If your radiators are heating unevenly, you may need to balance them. Follow our step by step guide on balancing radiators to help fix this issue.
www.onlyradiators.co.uk
When it comes to balancing radiators you might not know where to start. Luckily, our simple guide to balancing radiators has all of the info.
ukradiators.com
Balancing radiators is easy. In this BestHeating Guide, we look at how to balance radiators to save money and ensure energy efficiency.
www.bestheating.com
Are your radiators not heating up properly? Discover how to balance your radiators with the use of smart radiator valves with this step by step guide from Hive.
www.hivehome.com
The Ultimate Guide to balancing heating systems. Balancing a heating system is simply making sure all the radiators or emitters heat up evenly.
www.heatgeek.com
BUT, I'll grant you the caveat that
if you have modern TRVs (and perhaps the tool for them!) then it is possible.