Aye, maybe so. Although I'd bet that's a massive over-simplification. Doesn't give a bunch of bullshit merchants at the ECB and IMF the right to cripple their economy even further.
If they vote yes next week they may be able to negotiate an extension of the bail out - and Syriza will have caused nothing but economic carnage and capital flight in their 6 months, setting the country back about 2 years - for **** all. If they vote no then the place will turn to **** for a decade while they try to disentangle their country from EU open markets.