I've heard the same about having a number starting with zero. I haven't paid much attention because I've never had a PIN that started with zero.
In previous trips I've traveled with credit cards that had PIN numbers. In reality they were chip and signature cards because invariably the machine would say "signature required" and the clerk would ask me to sign a sales slip. Only rarely, maybe one time in two hundred, would someone not be able to figure out the process and I'd generally pay cash. I've also noticed automated train/metro ticket machines would reject my PIN but issue the ticket(s) anyway.
Before my last trip I got an Andrews FCU credit card that was supposed to be a true chip and pin card. In some cases, it functioned that way. In train stations, it would ask my PIN then say the PIN was good and give me a ticket. In others, it functioned like a chip and signature card. Virtually every grocery store or shop required a signature. I couldn't get it to work at an automated gas station (but I only tried it once). It worked at almost every toll booth (they don't ask for a PIN) except one where none of my cards worked and I had to use cash.