Well they are wrong. 500KG = 1100 LBs. Those would be massive.
The above picture has 4 x Rockeye cluster bombs (or whatever is the local version called)
These are the local version of Mk.20 cluster bombs and each one weighs around 450Ib's, they're locally called PSD-1. The picture is basically a screenshot from a video that was shot a couple of years ago. The Mirage-V in the video is actually carrying 10 Cluster bombs along with two AIM.9P's.
Sadly Air International is wrong there,they're 750Ib Mk.117 bombs.