The CBC’s boycott is denied by the CBC and isn’t reliably sourced so there really hasn’t been much public comment about it in the Jewish community.
IF there is a boycott with the CBC noticeable (as opposed to Democrats in general), and IF the White House is reliably sourced as having encouraged it, then it would be seen as anti-Semitic incitement. A lot of IFs until then.
If a disproportionate number of CBC choose not to show, then it won't matter what denials they issue.