Yeah, Kobo uses an old version of RMSDK that doesn't support EPUB3. Firmware 4.x uses WebKit for KEPUB, but I recall somebody said that firmware 5.x may have an updated engine.
Section 3.10 seems to say that scripting support is optional, so I guess DNSB would be correct that Kobo can ignore some or all of the functionality as the developers see fit while still claiming EPUB3 support in general.
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