Pretentious is definitely the word!
You say that the ones you know are left-wing politically, and with the word "Liberation" in their name, I'm not surprised. If their theology is convoluted, it could mean anything; conversely, if it were orthodox it would be simple and clear. Just because they haven't rejected the Church or its teachings does not mean they have not twisted them, either. I thought our Holy Father strongly discourages "Liberation Theology." Why is Abp. Wuerl involved with this group?
This is not exactly "Liberation Theology." It's more like standard European university liberal thought, which is vaguely Socialist, very statist and, of course, anti-American. They dress it up with the incomprehensible and wordy musings of their founder, or rapturous articles about Pasolini, etc.
Abp Wuerl may not be heavily involved - he gave a talk to them, so maybe it simply means that they paid his airfare and he talked. But given his attitude towards politics, according to everyone here who has known him in his previous job, I wouldn't be surprised if he's at least sympathetic to some of their positions. Again, they're not a group like "We Are Church." They're not actively opposed to any Church teaching and seem to support the Papacy, etc., but I think their European academic liberal mindset makes it very hard for them to sort out, shall we say, priorities. Some people do pass through it, however, and go into the religious life or find some other form of life that is more traditional.