I've been thinking about this one a bit more.

The intercontinental arrival/departure rule in question is as follows (with CX's questionable comma in parentheses).

2 PERMITTED IN ASIA WHEN 1 IS A TRANSIT WITHOUT STOPOVER OR ON DIRECT SINGLE PLANE SERVICE (,) BETWEEN THE SOUTHWEST PACIFIC AND EUROPE

The logic that I follow is:

- If you're on a direct single plane service between the Southwest Pacific and Europe then you're not going to transit in Asia.

- Therefore the "DIRECT SINGLE PLANE SERVICE BETWEEN THE SOUTHWEST PACIFIC AND EUROPE" can only be valid as a whole statement.

- If you put CX's comma into the sentence, the rule as a whole doesn't make sense.

- Therefore the rule must be read as:
2 PERMITTED IN ASIA WHEN:
- 1 IS A TRANSIT WITHOUT STOPOVER, OR
- ON DIRECT SINGLE PLANE SERVICE BETWEEN THE SOUTHWEST PACIFIC AND EUROPE

Of course my logic may be biased as I'm after those two long haul CX F flights.