In reviewing the FAA approved flight manual for a 1978 Cessna 210 (and aircraft certainly capable of getting into the part of the sky where IAS/TAS split noticably), the limitations clearly say that Vne is a speed in "KIAS". Cessna had the opportunity to define KTAS as the limiting speed measure, but met the design requirement with IAS. Therefore, I would agree that you could have well exceeded the speed number in TAS before you reached Vne in IAS - an that is obviously permitted!
By the way, as a further thread drift, and purely for my education, what is an "LAA" aircraft? I prsume it has an approved flight manual, with a limitations section?