To be sure, pretty much any/every source of “news” from the ME is fraught with bias. The loonier and otherwise patently false stuff from Arab-Iranian-Muslim sources tends to have Israel as the target rather than each other, however. And outsiders to forget that rivals - Sunni-Shia, Arab-Persian - do band together where common enemies are the focus. That Kuwait and the Saudis take a hostile view of or sees Syria as a regional rival isn’t clear to me. Iraq and Jordan lie between Syria and the Arabian Peninsula.
OTOH, Syria, the Saudis (and possibly Kuwait) have a common object-of-hatred in view in this particular case: Israel, who was the target of those missiles.
If you have serious information that contradicts these missiles having been chemical-capable, please post it, volk. As for the report in the OP article, I don’t see the source having significant bias (except possibly anti-Israel, which would make the report an admission-against-interest). And the report is entirely consistent with the Arab-Palis’ longterm strategy and tactic of promiscuously rocket-attacking civilians. So I see the report as quite credible.