It's a bit hard to prove an absence of rules... you show me the rule that could possibly be used to challenge it and I'll counter

The validator here: http://jph.bytestacker.com/award.htm accepts it so others agree with me. (Although it doesn't recognise the LAX-GUA-EWR direct seasonal flights)

The rules say only one entry and exit to each continent, but there are number of exceptions, of which transiting Asia en-route to/from SWP permitting a second entry is one. (The others concern re-entering Europe in conjunction with Africa, and re-entering N America in conjunction with S America.)

They also say that routing must be in a continuous direction between TC1, TC2, and TC3, which are the IATA terms for the three continent groupings I listed above.