Last update we had, not all contracts are insured, typically 5-7 per team. Though that could have changed in recent years. I doubt any ELC's are insured. And even if they were the insurance payouts don't kick in until after the player misses 30 games. For clarity: insurance doesn't pay the player--it pays the team/owner. The team is still on the hook for whatever the obligated salary is if a player is injured in the course of their employment by the team.
Pettersson is receiving his full NHL salary. The restricted or blended rate only applies to players who were injured during or before training camp.**
**Any player on a 2-way contract who is injured during or before training camp, and who received credit for less then 50 NHL games the previous season, is paid a mixed ratio of their NHL and AHL (minor) salaries based on the % of days they were on the NHL roster (including IR) the previous season. For example a qualifying player who was on the NHL roster for 10% of the prior season with NHL salary of $925k and AHL of $70k would be paid at an annualized rate of $925k * 10% + $70k * 90% = $155.5k, or $836/day while they remain on IR. If the player comes off IR and remains on the NHL roster then the full NHL salary kicks in.