I’ve literally just been having a read through that. Seems that indirect free kicks were in place before direct free kicks. I’m in reading it correctly.
Yes, in fact originally all free kicks were indirect. The first mention of free kicks was in 1872, for handling offences. The law stated that a goal could not be scored from such a free kick. In 1874, free kicks were added for offside, tripping, hacking, holding and pushing (all still indirect).
Direct free kicks were only introduced in 1903, for intentionally tripping, kicking, jumping at, holding, pushing, pulling or illegally charging an opponent and for handling the ball.
The law at that point said that all other free kicks were indirect (the kick off, corner kicks and goal kicks were classified as free kicks).
Just to mention that penalty kicks were introduced in 1891, but they were not classified as free kicks under the law.
All this info can be found in Wikisource, which has "reconstituted" copies of all the early editions of the Laws of the Game.
For instance, for the 1872 Laws, the link is:
https://en.m.wikisource.org/wiki/Laws_of_the_Game_(1872)
For the other laws, you can just change the year in the URL as needed.