If you use buffering substrate with the potential to leach ammonia or nitrates while it breaks down, the 2 month period is a necessity. Shrimp have a miniscule bioload in comparison to fish.
Contrary to this practice, I have placed shrimp (albeit only 3) in a 1.5 gallon tank within 3 days of putting eco complete (inert substrate) and several mature plants mated to a full spectrum desk lamp. They have since had babies and lived for several months until the summer heat cooked the tank. yes water changes were performed weekly in the 1.5 gallon tank.
If you have the attention to detail, the skill to keep on top of the water chemistry and the time to keep on top of the tank, then anything is possible. for the 99% of the folks just starting out with shrimp, Anything i just said is illadvised and you should wait the compulsory 2 months before adding any livestock.
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"I am Groot", the faithful protector