As I read it, it's saying that most traditional Buddhist teaching is focused on highlighting and removing the "craving for x" - you might call it 'indulgence'.
If one is geared towards avoidance behaviours (which are rooted in fear or aversion) they can easily think to themselves, "well that's easy enough... I don't want x anyway". Whilst that ticks the box in terms of "not craving for x", the avoidance behaviours underpinning that response might be masking a craving for other things - e.g. safety, security, a state of non-fear, a state of non-anxiety.
- I don't crave attending social functions... because I find them socially awkward and confronting
- I don't crave a nice car... because I'm too scared to drive
- I don't crave a promotion at work... because I'm scared of the extra responsibility and don't think I'm good enough
- I don't crave rollercoaster rides... because I think I'd freak out
- I don't crave holidays in the Bahamas... because I'm terrified of flying
Whilst the hypothetical respondent can say they don't crave, they don't endulge... this is really masking the shadow of fear and uncertainty that they're trying to hide from.
That shadow of fear and uncertainty needs to be outgrown and overcome if there is to be progress in terms of quality of life, and in support of the pursuit of the Dhamma... or in other words, craving is dukkha whether it's craving for indulgence or craving for safety - and overcoming craving is actually about finding a middle way through "indulgence" and "avoidance" and being mindful of when one is over-reaching in either direction.