CNSA is definitely NOT launching this one so that it fails. Thousands of people have given years of their hard work to reach this point.
Yes, the goal is lofty indeed, and Mars tends to swallow rather than embrace humanitys' fleeting attempts at reaching it.
But again, the only possible way to fail is to stop trying.
No they're certainly not building and launching with the aim of failing but the first attempt at such an ambitious project is riddled with uncertainties that are still unfamiliar until failures occur and can be investigated so that a learning process can commence. Preparing for failure is important for these people who have given so much because it allows them to better investigate how things failed and how they can be changed. It's an issue of technicalities. All the mission components are go but instruments to record and feed data are probably more embedded on this first attempt with this particular set up, stepping into the unknown of packing all this into the LM-5 with the aim of landing on Mars!
Anyway if the first step of launching is successful with this totally new payload for the LM-5, we'll find out how the landing goes in close to a year's time.