Whether the designers were "lying," in the sense of intentionally saying things that were not true or which were intended to mislead, is somewhat irrelevant to me.
What is more relevant, to me, is that they presented a set of statements which (pretty clearly by intent) set up particular expectations. Instead of coming forward at any point and saying, "Hey guys. These were the things we intended. It doesn't seem like those things are going to happen now. Times change and projects evolve, and that always means the end result differs from the initial vision, sometimes by a lot. In our case, we see this as missing a few details while really nailing the overall picture, but for some, the devil will always be in the details. We hope that, if you choose to dive into 5e, you too can see that the hopes we had for it are largely fulfilled. The whole team is immensely proud of their work, and we can't wait to see what you do with the game we've made. We hit almost every single goal we wanted to, and the end result is fantastic. I hope you all enjoy your time, whatever games you choose to spend it on!"
This is, obviously, 99.9% corporate drivel by volume, platitudes and happy-speak with little real content. But it would have meant a lot to me for them to say, even through all the PR filters and such, "Yeah, some of that stuff we said we were going to do...we never actually did. Hope you still like the game we made."