I just bought an old FMA balance pro HD 6s lipo charger and I found some information that worries me. It says then the charger can only charge fma balance pro packs. Do you think I can charge all my lipos with this?

Here is the page I found this on - http://www.fmadirect.com/support_docs/item_1190.pdf

WARNING!
The FMA Direct BalancePro HD 6s Charger is designed to charge only
FMA Direct BalancePro HD lithium polymer battery packs and FMA Direct CellPro lithium polymer
battery packs. Charging CellPro battery packs will require the use of a BalancePro HD-to-CellPro
adapter. Using this charger to charge any other manufacturer’s battery may result in fire,
property damage or bodily injury.

Is this warning legit? I know this charger is old so I'm thinking it might be different now.