Yep. I'm 99% sure it still scales like before. I'd prefer if it were changed. One of my biggest complaints about this game is you are better off using all the one-time-use abilities and completely ignore planting any great people. I'd love to have a bunch of factories in an industrial-heavy city, but you get way more hammers by rushing a wonder. If you are quick enough you can get by with an academy or two, but generally the same thing. I don't know of anyone who regularly uses planted merchants.
Well I don't know anyone who gets any merchants

But I wish they adopted the same mechanism for GS as for GMs. I rarely plant GEs but would do more at lower levels, as chances of missing key wonders diminish.