Current thinking is... they didn't bother to read the report. Otherwise, they would have quashed it.  

No, it means that the USA is the only country not beating their breasts and spouting about how GOOD they are.  The Accords do nothing, promise nothing, have no power to enforce anything, a piece of do-gooder activity.

No, they encourage each country to set goals. 

The Agreement aims to respond to the global climate change threat by keeping a global temperature rise this century well below 2 degrees Celsius above pre-industrial levels and to pursue efforts to limit the temperature increase even further to 1.5 degrees Celsius.^[5]

In the Paris Agreement, each country determines, plans and regularly reports its own contribution it should make in order to mitigate global warming.^[6] There is no mechanism to force^[7] a country to set a specific target by a specific date,^[8] but each target should go beyond previously set targets.

... In July 2017, France’s environment minister Nicolas Hulot announced France’s five-year plan to ban all petrol and diesel vehicles by 2040 as part of the Paris Agreement. Hulot also stated that France would no longer use coal to produce electricity after 2022 and that up to €4bn will be invested in boosting energy efficiency.

https://en.wikipedia.org/wiki/Paris_Agreement

It's certainly better than doing nothing, which is what the Trump administration wants to do.