Hmm... I'm not sure I agree with the two comments above. Yes it's not explicitly mentioned in WCAG 2.0 itself but it is implied by proxy:
Checkpoint 4.1.1: H88: Using HTML according to spec
"Using features in the manner prescribed by the specification The HTML specification provides specific guidance about how particular elements, attributes, and attribute values are to be processed and understood semantically. Sometimes, however, authors use features in a manner that is not supported by the specification, for example, using semantic elements to achieve visual effects without intending the underlying semantic message to be conveyed. This leads to confusion for user agents and assistive technologies that rely on correct semantic information to present a coherent representation of the page. It is important to use HTML features only as prescribed by the HTML specification."
Therefore when the HTML4 and HTML5 spec both say:
“Tables should not be used as layout aids [...] If a table is to be used for layout it must be marked with the attribute role="presentation"”.
Then by proxy, using tables for layout would fail the technique (unless role="presentation" was used - which should be a last resort) and fail checkpoint 4.1.1 (Level A). Quite a tedious link but in short using tables for layout would mean you are unlikely to be WCAG 2.0 complaint.