That only applies to silicon revision A3 and A4.
As I read it, that issue was introduced in 'Rev C Document (4/2014)', then last updated in 'Rev E Document (9/2014)', and AFAICT has not been changed since, so I assume the update in 'Rev E Document (9/2014)' is when it says the issue does not apply to A5. So, presumably silicon revision A5 has been available for almost two years.
So it is likely that you will be buying A5 silicon, or you can ask your supplier to guarantee it is A5.
Having said that, A5 silicon is only guaranteed to work with a
ABLS-LR-12.000MHZ-18-D-R-T crystal, so use one of them.
This doesn't mean other crystals with the same spec won't work, just that it is the only one they guarantee will. If this is a product, use the guaranteed part. If it is a one-off, or the part is very hard to get, try to find a very similar spec. alternative, and test it. It will likely work.
The quote for A5 silicon is on page 19:
Module: Primary Oscillator
To use the Primary Oscillator with a crystal, only the following crystal is supported for PIC32MZ EC family devices:
XTAL = ABLS-LR-12.000MHZ-18-D-R-T
No other crystals
are guaranteed to function 100% over voltage, temperature,
and population. Adequate testing required in your application
to ensure reliable operation.
From that, I assume that an external crystals can't be used with A3 or A4 silicon. However, unless you already have those chips, it is unlikely to be relevant.
The quote for the overall issue is:
Depending on the revision of silicon, a
crystal oscillator cannot be used as the input to the Primary
Oscillator (OSC1/OSC2 pins).
For Revision A3 and A4
silicon: Use an external clock or an internal FRC.
So I read that as being clear, A3 and A4 silicon can't use an external crystal.