For the record, the FAA specifies LOC-critical protection areas
only at the far end of the runway (between the antennas and the runway end). See page 33 of the .pdf (page 2-11 of the document).
https://www.faa.gov/documentLibrary/...ing%5B1%5D.pdf
Therefore an aircraft holding on the approach end (piano keys) of the runway is
not in a localizer-critical area - at least in the US.
Of note, KAUS has exactly one (1) ILS-critical ladder-marking on the entire airport - across the dedicated taxiway east of the incident runway leading to/from the TxDOT ramp.
https://www.google.com/maps/search/A.../data=!3m1!1e3