This story has been out about 2 weeks, again, Syria and Russia were also accused of allowing ISIS to flee to avoid a bloodbath, that was probably about 4 months ago.
From the article:
by Leith Fadel via Al-Masdar News
Al-Masdar's coverage focuses largely on conflict zones in the Middle East: Syria, Yemen, and Iraq. Al-Masdar has several Syria-based correspondents, and claims sources within the Syrian military. Al-Masdar has been described as being pro-president Bashar al-Assad.
https://en.wikipedia.org/wiki/Al-Masdar_News
Rely on the website if one wants to, the same for Zero-Hedge, sometimes they may be right, at other times, it was already posted here, how they seem to post "Russian agitprop" again per wikipedia.
At the least, this is not CNN, ABC, Fox, etc. and if one finds fault with those news outlets, let's remember, neither Syria nor Russia nor Iran are rated as free countries.
But if one can cast a stone at Trump from news sources such as above, so be it. Some of what the Iranians post is simply laughable.