Bernd,
Yes. The limitations you describe from two-years-old information are in line with normal practice for conventional APUs back to the 1960s. Unfortunately, as I've commented before, I was never clear whether the delay before a third start attempt was to avoid overheating the starter motor, or the battery, or to give unbernd fuel a chance to drain into the drains tank (from which it is subsequently ejected!).
However, this APU, unlike others, is not required to provide the vast amounts of bleed air needed for air conditioning and (pneumatic) engine starting. So it is a very different beast, I guess. Presumably, the "rotor-bow" problem described by TURIN only came to light on service entry.