"Darren Helm’s NTC kicks in immediately and goes through the first three seasons of the deal (through 2018-19) with no modification. Only Helm waiving this clause would allow him to be traded.
If the Red Wings miss the playoffs in the 2018-19 season OR if Helm isn’t among the top 9 forwards on the team in terms of total ice time, then he will have no NTC protection between June 15th of 2019 and the trade deadline of the 2019-20 season (Year four of the deal).
If the Red Wings miss the playoffs in the 2019-20 season OR if Helm isn’t among the top 9 forwards in terms of TOI, then his NTC is void from June 15, 2020 throughout the remainder of the contract (June 30, 2021).
While any NTC probably shouldn't have been included, it was probably insisted upon by Helm's people so that he won't be headed to Vegas.
This quoted section, however, should alleviate some of Dickie's worries about Helm ending up on the 4th line in a few years. The team seems to be worried about that as well and left the option open to trade in that case.
To pre-empt some responses, If he plays himself onto the 4th line, then he might not be tradeable (at least without retaining some salary). It think it would be more due to our prospects taking over, though.
Deal was a year too long and a bit too much, but I'm still glad Helm's back.