There's the typo,
It should read 1-2 months, not 12.
It does no harm to do more water changes, it'll only help, but we often find after the tank grows in, there's not as much benefit.
Slower growing tanks with slow growing low demand species will also have much less need, or a non CO2 might not have any need for a water change if set up correctly, just top offs for water replacement from evaporation.
Really depends on the tanks and how folks approach things. Each tank will have its own issues and often times, if things go bad, water changes fix a lot and then you can focus on the root issues etc.
Almost always a good idea to do them rather than avoid them.
My 120 Gallon, I';ll do 2x a week, 60-70%. I dose after the water change. I dose traces daily for the most part.
My 180, maybe 1-2x a week water changes 75%, dose 2x a week and daily for traces.
70 Gallon Buce tank, maybe once a month, 50%, dose 2x a week lightly.
Traces, 3x a week.
120 = gardened intensively, uprooting etc.
180= moderate gardening, less light
70, not much gardening, no uprooting, maybe 1/4-1/3 the light in the other two.
Fast, moderate and slow rates of growth and plant species chosen.
Could I do more water changes in the 70? Sure, would I get much return for the labor? No, not really. I still did them for awhile and error on MORE rather than LESS.
You can then taper off and note the aquarium and plant responses from less ferts, or less water changes, or less light or less CO2 etc.
But start high initially.
Then vary one thing at a time.
Once you see something negative, then you revert back to the last highest dosing or frequency. This way you target the best growth, with the least amount of input.
You do not start out not doing any water changes and then slowly increase them to see. By then you have stunted plants, algae etc. Same is true for dosing ferts. You start at a non limiting amount, then reduce slowly.
Then way the plants are happy from the start and you only see the more subtle issues when the ferts run out. Then you bump back up to the last highest dosing or frequency etc etc.
Some might have like my 70 gallon and think ALL aquarist should/do have similar tanks and thus should do that same easier routine.
This is poor logic frankly and makes a large insurmountable assumption.
The 70 Gallon is now very easy to maintain, but there's no way I could do that on my 120 Gallon tank.
Just keep that in the back of your mind as you think about and read things about water changes.