The Lancair involved in the incident to which you referred didn't spin into the ground because it was going too fast.
The fatal accident I was referring to (if you want to be pedantic there is a difference between an incident and an accident) was caused by what then?
The report into the fatal accident involving the Lancair included this information and is not type specific but refers to the general classification of amateur built aircraft:
In 1997, following a series of investigations of accidents involving amateur-built experimental aircraft, the US National Transportation Safety Board (NTSB) issued
several related safety recommendations12. The NTSB stated that ‘some accidents may be related to inadequate flight training by pilots who … transition into
amateur-built aircraft, which have flight characteristics that are unfamiliar to them’. The safety recommendation letter also included the following comments:
The [NTSB] recognizes that the vast majority of pilots learn to fly in typecertificated aircraft, which have been tested and demonstrated to have
stability, controllability, and performance characteristics that fall within a defined envelope. Further, after their training, most pilots continue to operate
type-certificated airplanes, which comprise most of the general aviation fleet. Consequently, it may be difficult for them to transition to many amateur-built
aircraft, which may have flight characteristics that fall outside the familiar envelope of type-certificated aircraft, without the benefit of transition training.
…
The [NTSB] concludes that type-specific flight training is critical for pilots transitioning into amateur-built experimental aircraft. …new owners who
acquire amateur-built experimental aircraft in the secondary marketplace should have the opportunity to receive transition training, unless their prior
flight experience makes it unnecessary.