If you click the total on Cap Friendly, you can see how they came up with that number. They are assuming 300K in performance bonuses this year, which I doubt he gets all of.
The maximum signing bonus you can give on an ELC is 10% of the total, so 92,500$ per year. Total amount for all performance bonuses is 850k. Any individual bonus is capped at 212,500, but can be broken down to different levels (example: 100k for 10 goals, 112k for 10 more). an ELC can also include games played bonuses for 5, 10, and 10+ games. 5 games is capped at 25K. Any remaining games played bonuses has no limit, other than the total limit for a bonus (including the 25k for 5 games).
For a defenseman, the performance bonuses available to get (if negotiated for) are:
- being top 4 in ice time (minimum 42 games played). For an ELC, this can be the total ice time, and/or per game ice time
- total goals scored (minimum 10)
- total assists (minimum 25
- total points (minimum 40)
- points per game (minimum 42 games, .49 ppg)
- plus minus (top 3 of club D, 42 games minimum)
- blocked shots (top 2 of club D, 42 games minimum)
- End-of-season all-rookie team
- NHL all star game
- NHL all star MVP