Are those snooker tables or pool tables outside in the park??
snooker tables have curved pockets and pool tables have straight cut sides for pockets...
They are playing Pool on tables with curved pockets - wonder if you can call it Snoopoo?
I am not sure that China is any different to New Zealand, where both games are played on a snooker table. If there is a distinction it is that Pool is generally played on small-sized tables (as found in entertainment areas and pubs), while Snooker is the game of choice on a full-sized table.
Those observations are based on the English version of the games and it possible, I guess, that a table with straight pockets relates to American Pool ('8 ball'?).
I am happy to be corrected on any of these points!