Perhaps, but we don't know for sure yet either way. Judging by some of these accounts there's an awful lot of coincidence going on, so instead of dismissing any and all claims I'll try to keep an open mind for a while and see if there's any truth to it Tipping is in the game for a reason, so it'd be nice to know what the reason is, even if it's not boosting one's shiny encounter rate!
This. I don't know how people can say it's rubbish when nothing has been confirmed or can be confirmed yet. It'll be a few months until shiny rates are discovered properly, so until then I'll have fun trying new tricks!