all the same tick NW change would do is have you send multiple fleets to science planets, pass them around on the same tick without blowing infra and then whomever has the most or least (still not figured that bit out (most likely least)) Research points will keep the planets (final attack, send the most ground possible) and build lasers until ready to do again. The reason for using the science planets and not something like octarine planets is that they will most likely be the most built for the strategy to work and will carry the most NW to ensure no infra is lost and that you can get as low as possible once you pass the planets to someone else (ensuring higher science when you build).
If the NW is calculated mid tick (such as on planet hands change), you could even run this strat between multiple groups of 2 players because the only real thing that needs to change is to have as little NW as possible so that A) you can have massive science and B) you can take the planets back without blowing infra (so that the other empire can then have super low NW and build that tick).
Yes this is slightly slower than having one high science player that takes all of the planets but due to the nature of it, it can be done every tick-2 ticks or whatever so that you are constantly building.
Here is an example scenario (E = Empire):
E1 has 5 planets that they want to build on and 5 science planets that they have just held for 10 ticks, giving a lot of RP but due to NW has a little amount of con science.
E2 has 5 planets that they want to build on, has recently held a lot of science planets but has just passed them onto E3.
E2 has now had his NW recalculated and so his con % hits like 70% or something. E2 builds until he has hit his next building cap (doubling his OB% or whatever).
E2 or E3 takes the 5 science planets from E1 (if E2 is the bigger banker then it may be nice to let him have the 5 so that he can keep building RP for when that infra comes in, allowing for another jump in 12 or whatever ticks).
E1 has now got like 50-60% con or whatever because his NW has just recalculated the same tick. E1 builds big.
The details are not there clearly but my point is that if NW can recalculate on the same tick, it will have the opposite effect when you give planets to another empire (increase science) to that of taking planets off of a player (decrease science (the thing that a lot of people are mentioning)). The way proposed and looks to have been coded by pie, with the NW still being on next tick but not allowing new buildings on them for x time is a lot stronger against con jumps.
Even though it stops the current way of con jumping, my second point there is that there are always ways to do so and tbh, the example I showed will still work with the way pie has coded, just needs the one tick to do so (as it waits for NW recalculation).
Please just wait and see what happens as I am more than sure that if you want to find a way to con jump, you sure as hell will as nothing will take away cheaper buildings unless pie turns around and disables con science for the round.