Earlier quoted context omitted.
I have no idea and probably not, but it is a bit more complex than that. There isn't any particular rule saying that the only functional democratic model is multi-party democracy. One could imagine a successful democratic model with one party allowing diverse internal factions, for example. It is really hard to get a read on China, but their success raises some interesting questions of how exactly their internal part…
From what I've read (and this may very well be outdated), Singapore is generally democratic, but the PAP does such a good job of running the country that people don't vote for other parties.
1. (an increasingly smaller portion) The PAP has done this well thus far and brought us to the first world 2. (a large portion) The PAP has too much power and can silence all its opposition - I don't want to suffer the consequences it has historically delivered upon its detractors by voting against them 3. (an increasingly larger portion) The PAP is good but it has too much power and has been allowed to engage in rampant authoritarianism and ivory tower bullshit - the opposition politicians would do a better job 4. The PAP is unequivocally bad and should never be in power (due to their historic actions like underpaying the Malay population for their land, operation Coldstore, etc.)
Additionally, the government blatantly engages in any tactics they can to get more votes, with documented widespread gerrymandering, holding snap election dates right after major PAP wins to capitalised on increased positive sentiment without giving opposition parties time to prepare, silencing/deplatforming opposition politicians, and enacting laws that prevent anyone but their chosen caste to be elected to positions of power