From their statement:
As a military organization on the other hand, the Syrian Arab Armed Force, is structured around Honor, and Dignity. Every soldier was raised to honor the military code, despite the fact that some individuals dishonored it at some point.
As a military organization, the Syrian Armed Forces will not be beheading ISIS terrorists, again even if some Syrian Army Soldiers individually have done that at some point, but even in the most professional armies in the world, there are individual actions that do not comply with the organization's policies.
However, do not expect us to show ISIS any mercy, the Syrian Arab Army will retaliate, and ISIS terrorists will beg to be beheaded at some point. They lost every right as humans the moment they stepped on a Syrian soil, and the Syrian military will not treat them as humans.
That's quite a disconnect. In the space of two paragraphs, the Army goes from saying it acts with honor and dignity to justifying treating captured prisoners as non-humans.
Another headscratcher: It says it could take out ISIS in Raqqa in a day, but it won't because that would harm the innocent civilians ISIS has been using as human shields. The Army has repeatedly bombed Raqqa, Aleppo and elsewhere, killing civilians, including children. See the Syrian Observatory for Human Rights which keeps track. What alternate universe is the Syrian Army living in?