This is rubbish. Don’t believe everything you read.
You have the right idea but let’s put this in context.
What you perceive to be maximal effort on your part may not be the effort you are fully capable of producing. This comes with experience and training with, and watching bigger and stronger guys train.
You should normally be able to increase the weight when the muscles get bigger. If the weight isn’t increasing, then it’s either a problem with point 1 or your diet.