Other than the manual transmission flush, all of the other items are legitimate and could very well be needed.
The factory owners manual is not the final word as some would have you believe. The factory wants to convey the impression that their cars need very little preventative maintenance so therefore they skimp on the “probably oughtas”.
They all do this.
You state the car now lacks power on the upgrades. Check the owners manual and see what it says about spark plugs and fuel filters for starters. If the plugs have never been changed that should have been done about 40k miles back. If the fuel filter has not been changed then that little chore is about 75k miles past due.