The link you've provided has a pretty comprehensive set of dimensions. One bit of text that jumped out to me is worded "See sheet 2 for recommended PC board layout."
I would read the reference of 0.127 / 0.097 as a difference of 0.030, which would then translate to 0.112 +/- 0.015 which appears consistent on many of the measurements. A couple appear a bit tighter at 0.020 or +/1 0.010 here and there.
The reference to Max is not so much to determine hole placement as it is to provide you with a dimension that the part will not exceed. If you allocate 0.225 for the shell, you'd have 0.001 clearance for the housing/components/accessories placed adjacent to that portion of the connector. It's not impossible to consider that the 0.224 Max could be measured at 0.220 which would still not cause problems for a design that allocates 0.225 in the housing/case.
Another location on the document specifies that the tolerance is +/- 0.010 unless otherwise specified. That means that the diagram on sheet two which has no tolerance listed individually for the PCB hole layout would be assigned that figure.
The above is a layman's interpretation mixed with a bit of mechanical drawing instruction and a good bit of tradesman's osmotic absorption from a career machinist (60+ years). It could be incorrect.