The page has no mention of the fact that tables are unsupported. Is there any page where the topic is covered? Information on the new PDF rendering is scattered all over the place so I don't know if this is the best page still.
In any case, here are some things to watch for when adding tables support (taken from the mwlib tracker):
- http://web.archive.org/web/20110800000000/http://code.pediapress.com/wiki/ticket/833
- Empty cells are ignored
- assigned – volker – normal – major – 18 months
- http://web.archive.org/web/20110800000000/http://code.pediapress.com/wiki/ticket/845
- Find a way to force a "vertical no break"
- assigned – volker – normal – tweak – 18 months
- "Some small tables should never be split"
- http://web.archive.org/web/20110800000000/http://code.pediapress.com/wiki/ticket/504
- Rendering of Infoboxes and other tables with specific width or nested tables
- accepted – volker – normal – major – 2 years
- http://web.archive.org/web/20110800000000/http://code.pediapress.com/wiki/ticket/870
- Table is centered
- assigned – volker – none – feature – 13 months
- http://web.archive.org/web/20110800000000/http://code.pediapress.com/wiki/ticket/919
- Table titles unrecognized / displayed improperly
- assigned – volker – urgent – major – 11 months
- http://web.archive.org/web/20110800000000/http://code.pediapress.com/wiki/ticket/933
- Pipes in images found in tables
- new – ralf – urgent – major – 8 months
- http://web.archive.org/web/20110800000000/http://code.pediapress.com/wiki/ticket/939
- Do not automatically exclude tables/divs with class="navbox"
- assigned – volker – urgent – major – 8 months
- http://web.archive.org/web/20110800000000/http://code.pediapress.com/wiki/ticket/753
- table caption parsing fails
- new – ralf – normal – major – 23 months
- http://web.archive.org/web/20110800000000/http://code.pediapress.com/wiki/ticket/774
- HTML tables not parsed if opening table tag missing
- new – ralf – normal – major – 21 months
- http://web.archive.org/web/20110800000000/http://code.pediapress.com/wiki/ticket/889
- sole  : in table cell dropped
- new – ralf – normal – block – 13 months
- http://web.archive.org/web/20110800000000/http://code.pediapress.com/wiki/ticket/932
- Table background not properly rendered
- new – volker – normal – major – 8 months
- http://web.archive.org/web/20110800000000/http://code.pediapress.com/wiki/ticket/442
- huge tables can not be rendered --> treecleaner?!
- new – volker – low – feature – 3 years
- http://web.archive.org/web/20110800000000/http://code.pediapress.com/wiki/ticket/744
- Gaps in tables for no apparent reason
- assigned – ralf – low – tweak – 23 months
- http://web.archive.org/web/20110800000000/http://code.pediapress.com/wiki/ticket/817
- tables unnecessarily removed by treecleaner
- new – volker – low – tweak – 19 months
- http://web.archive.org/web/20110800000000/http://code.pediapress.com/wiki/ticket/462
- tables with cells exceeding page height fail
- new – volker – normal – feature – 3 years
- http://web.archive.org/web/20110800000000/http://code.pediapress.com/wiki/ticket/649
- improve border rendering for tables
- new – volker – normal – feature – 2 years