Unfortunately, that does not appear to be correct. I don't know of any source that denies that Philly gets our unprotected 2019 pick. I don't quite understand why.
The Stepien Rule, as we know, says that you cannot make a trade that, at any time, leaves the team with the possibility of not having a first-round pick for two consecutive future drafts. (The qualifier "future" is not relevant here, but does allow teams to trade their first-rounders on draft day regardless of any possible future debts they may have.)
When we made the Philly trade, we apparently set up the first rounder as a top-10 protected 2018 pick, contingent on the 2016 pick conveying to Chicago. When the 2016 pick did not convey to Chicago, the 2018 pick contingency was violated, and the pick became a 2019 unprotected. Every report I have ever seen on the pick says that this is the case. I've never quite been able to make sense of this. The only thing I can come up with is that the following might be true:
It is legal to trade a pick contingent on a pick from a different trade being conveyed, but it is not legal to trade a pick contingent on a pick from a different trade NOT being conveyed.
We apparently did the former in the Philly trade. But to hold the 2018 pick now, we would have to have done the latter. That's the only sense I can make of it.