The weapon listing for the [Laser] variant of the Salamander you gave is the correct listing (verified when I opened up my 3058 pdf). The only excuse I have is, beside writing the wrong values down, that I included the Anti-Personnel bonus (since the box is unchecked, this error is mine).
I will respect that "might do damage" is a qualifier to negate the PV reduction as you outlined. [I'm not happy about it, but that's an opinion ;) ] Something more clear and definitive should be added to page 141 so someone else doesn't follow my mistake.
And speaking of my mistake, in undoing the *0.75 for all my calcs, I get the following:
. Salamander BA [Standard] 15 PV; OFV = 5 (2 Short, 0.5*2 Medium, 0 Long, 2 HT), DFV = 9.75 (8 DIR, 1.25 MF, 0.5 DSAF)
. Salamander BA [Anti-Infantry] 14 PV; OFV = 4 (3 Short, 0.5*2 Medium, 0 Long), DFV = 9.75 (8 DIR, 1.25 MF, 0.5 DSAF)
. Salamander BA [Laser] 14 PV; OFV = 4 (2 Short, 0.5*2 Medium, 0 Long, 1 HT), DFV = 9.75 (8 DIR, 1.25 MF, 0.5 DSAF)
I hope this helps.