That is very very outdated. If you go on the TL in this day and age you will never see any players above 400k and only a handful of players above 300k (Maybe 10-20 in the BB World).
I base my salary caps off of buzermanager:
(http://www.buzzer-manager.com/estimation_salaire/)There is a player salary tool on the site that is much more updated (although it too could use a revamp). Regardless, it is much more accurate in judging player salaries and salary caps for potential, so you can play around with it if you want. I'll do a rough estimation based on the calculator since I have time, and it is still not perfect, but It's much lower than the BB guide from 5 years ago.
You're doing a good job expanding early then! It's super nice when you are done with your arena and don't have to worry about it any more and just just focus on getting players for your team, so keep up the good work!
IF THIS HELPS:
My rough estimations for salary caps-
Announcer: <2k
Bench Warmer: 2-4k
Role Player: 4-6k
6th man: 6-9k
Starter: 9-15k
Star: 15-22k
AllStar: 22-39k
Perennial allstar: 40-59k
Superstar: 60-89k
MVP: 90-159k
Hall of Famer: 160-249k
All time great: 250k+
This is based on off the player salary simulator and it hasn't taken into account the changes for SBing cost and the few other changes so it is a little off, but that is the general consensus for the caps right now.
Murray/Harris/MPJ/Grant/Jokic - 2020 NBA Champs