now i just need my other 2 questions answered (availability and price estimate)You're probably right, but the fact sheet is clear (if you know the specs of the TPA chips).
Since we are dealing with Multi-Channel amps I should have been a little more precise:
Support for and full power down to 2 ohms requires one TPA325x chip per channel.
=>
PAMx52: 2 TPA chips
PAMx53: 3 TPA chips
PAMx54: 4 TPA chips
PAMx56: 6 TPA chips
... and so on.