It would be useful if you could provide a link to what you're talking about.
If you're referring to this then yes and no. Yes it could be applied to VS 2019 as it is not really a theme but just a bunch of VS settings and therefore can be imported. However VS 2019 and VS 2022 actually support theme files and this doesn't appear to support that. Therefore it'll be limited to what font/colors VS settings allows. However the Github repo seems like it is forked so perhaps someone created a theme for it.
Alternatively you can google for VS themes and find many themes that probably line up with the theme. Alternatively you can build your own using the [VS Theme Editor(https://marketplace.visualstudio.com/items?itemName=VisualStudioPlatformTeam.VisualStudio2019ColorThemeEditor).