I doubt the BBC would be "lying," which would presume deliberate falsehood. They could, of course, be misinformed, or lack the military expertise to understand certain data (rather common in the media).
The BBC report that I saw cited a total of 95 pieces of "heavy artillery" in the Georgian inventory (without defining what was "heavy," but including MRLs). Their source was Jane's Sentinel Country Risk Assessments.
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