See now it contradicts it purpose if you approach it that way. Because with freedom you effectively remove the happiness penalty of said specialists, you cut their food in half and effectively you gain the bonuses of order some turns later in addition to the specialists. The food cuts are send back in the pool and give you citizens empire-wide, given that you have research buildings into place even one more citizen will out match orders flat 10 science. Hospitals and such taken into account. With freedom you loose only half by using specialists and the other half is send to be processed in row pop, which means more raw science. Add the statue to this and you outmatch order completely in the specialist/science game.
What I'm saying is that with domestic trade routes, you can get ANY city to insanely high amounts of pop, so food is not necessarily = more pop. It's equal to more food. Before, in G&K's limited world... the idea is that you can't get food or grow your city BESIDES having food from the city + CSs.
Now, you can has food and as much food as you want, all only at the opportunity cost of gold. So, now, with your 18 specialist slots or however many you put in your capital, you essentially get +18 food in capital, +12 food elsewhere (assuming you have the buildings). This is really nice! But it's just food, not science, and it has diminishing returns in BNW.
You can no longer absolutely tie it to science the way you could in G&K. Is all that extra food better than +25% science (which raw amount gets higher the more population the city has)? Maybe. It depends. If you have really large tall cities? Then no, it's not better. If you have medium sized cities with all the buildings? Then yes, it is much better.
In a raw comparison between +25% science output per city, and +1 food per specialist. VERY populous cities will benefit more from +25% science than food. It's that middle zone where freedom shines, where you having enough structure to have a ton of slots, but do not have enough population to be able to sustain a specialist city.
In a maxed out (or nearly maxed out) city, where you CAN support all specialist slots, +25% flat is better than more food. That's just math.
So, perhaps unintentionally, Freedom is better for a mid-sized tall civ (or OCC), but if you have 2-4 cities and trade routes pumping food consistently throughout the game (as for a science game you should), Order is arguably better. 4 cities is probably a breaking point, since it takes 9 trade routes to constantly send food everywhere, but I'm pretty sure the math on 3-cities will work to Order's favor.
This is speaking purely about Science. Now, the Statute of Liberty is of course a different story and much better than Kremlin for a Science game.