The rest of your post was good, but this is woefully inaccurate 1-2kg muscle a year, that's only for guys who already have years of solid training under their belts.
As a novice, healthy young man with decent genetics and if you're willing to eat and you're on a good program you can gain plenty more than that.
Muscle??? You’re kidding yourself if you think you can pick up more muscle than that.
There’s a big difference between weight and muscle. Very easy to pick up weight. Heck eating more carbs means 1 gram of carbs keeps 2-3grams water weight.
The pros even when they bulk up, up their carbs drastically, get ‘puffy’, and unless you’re top 0.01% of the population that can bulk up and maintain low body fat it’s impossible.
Like I said big difference between muscle and weight. Bottom line, there’s no shortcuts and it takes long term consistency to a plan to make changes.
Unless you’re the top 0.01%.