That is crap. Neither of them will be offered 10 million a year. They are great players but they aren't at the same level as the Crosbys and Stamkos's of the league.
Here are the comparable (in terms of production) players and their salaries:
Zetterberg: actual salary next year 7.1 mil. cap hit 6.08 due to conrtact length gimmick that the league will not toleraate anymore, as they showed with Kovalchuk's contract.
D.Sedin 6.1 mil./ 6.1
E.Staal 8.5 / 8.25
Kovalchuk 11.0 / 6.67
Iginla 7.0 /7.0 that contract was signed waay back.
Sharp 6.0 / 5.9
Parise is younger than all of them, but Sharp, and to sign him long term would require an increase, at least 20%, over what those guys are making. So if we take a conservative route, average of all the above players, Parise's agent would ask for 10 and won't come down below 8.5.
Given that Parise is THE premiere forward UFA this season, I would expect that he will get closer to the asking price than the minimum one.
The final number will be modified by playing with throwaway years on the contract and such, but with the league shown displeasure with such doings, I expect that the cap number will be close to the real salary.
His comparables: Weber 7.5/7.5 (1 yr and RFA only would command way more for the long-term UFA contract)
Hamhius 5.0 / 4.5
Letang 3.5 / 3.5 (signed as RFA, so UFA contract would be much higher)
Keith 8.0 / 5.5
Seabrook 7.0 / 5.8
So an average of these 5 +20% is 7.5 and Weber's and Letangs number are too low. So Suter's agent will start with 9.5 and come down to no less than 8.25. Again, Suter is THE best UFA defenseman this year, so he is likely to command closer to 9 mil. than 8. Again, I assume that the real salary does not get too different from the cap hit.
So, assuming a long term contract, Parise will cost 9-10 mil, and Suter 8.5-9. Together they will command 17.5-19 mil. If they decide that Detroit only needs to add the two of them to win the Cup next season, they may agree to a one year package deal at significantly less, but if you were in their shoes, which team would be the most likely to win next year with their addition? I doubt it's Detroit. And any GM in a league will do a lot to add those two. Including trading away major players if the cap limit demands it.