Rubbish. The Sony NEX 5N comes in PAL and NTSC flavours, described as PAL and NTSC. The only difference is the recording rate - it uses neither NTSC nor PAL encoding schemas. Everyone understands what is being talked about with the use of PAL in this context, just as they understand that gigabytes = 1024 x 1024 x 1024 bytes without needing to clarify it as gibibytes. Consoles are sold as PAL boxes despite not outputting PAL signals (there's no such thing in the HDMI spec).
Unless you can specify a technical issue with the use of the term PAL when discussing 50 Hz content causing confusion, you're being unnecessarily pedantic (coming from me of all people!). It's how the CE industry distinguishes between territories having 50 Hz and 60 Hz content based on legacy broadcasting standards.