Incorrect airspeed values in Turbine Duke manual?

[PAStime]

Love this plane. Currently in Greenland on my way to Norway from Canada. The info below is from page 13 of the manual. The numbers seem way too high. I searched but didn't find any other posts about this. Agreed, or am I missing something? A minor fix for a future manual revision.

Aircraft Performance (Turbine Duke) Maximum Cruising Speed 320 ktas
Normal Cruising Speed 290 ktas
Economy Cruising Speed 225 ktas

[Jiblet]

Can't say I fly the Duke much so take this with a shovel of salt but are you confusing TAS and IAS by any chance? Or have I missed the point?