“Public sector of the economy as proportion of GDP” is “Government expenditure, percent of GDP” (what you linked) + State Owned Enterprises (public corporations owned by the country) so it’s a little bit different.

In my previous comment I though you’re misusing the term public sector to mean only SEO (as is commonly done), that’s why I asked for source.

The source you linked, while good, is only showing government expenditure without SEO, so it does not cover your original claim though. Unless in the original comment you did misuse public sector to mean only government expenditure?