I agree with the writer that Lamar's stint with the Ravens is probably coming to an end. From the club's point of view trading him makes sense if they feel that 1) his demand of a fully guaranteed contract is simply a non-starter, 2) they have serious concerns regarding his durability and recovery time especially late in the season when it's most important and 3) they have decided to go in a different direction with a more pro-style balanced offence and they don't think Lamar is the best fit for that.
Its possible too that they are just fed up with all the drama especially if they feel he could have played yesterday and that he was using his injury as leverage and as a message to anyone who might be interested that he's not backing down from his demand for a full guarantee. Lamar best knows whether he could have played. We hear different things regarding PCL strains, including that they generally do not require surgery and don't get worse or extend recovery time if played on. Maybe this is true only of mild strains idk. If Lamar really was physically unable to play or if playing seriously exposed his knee to more and possibly permanent damage like RGIII, then unquestionably he made the right decision. But if it was all just part of negotiating leverage I don't think I'd want him and I wouldn't blame the Raven's for deciding to move on. Regardless of what they say publicly the Raven's brass probably have, and are well positioned to have, a view one way or the other. The rumour is that the team is very frustrated with Lamar.