Yes, I'm not surprised, I thought it has to be a rather old instrument that focuses on piano sound, so that the resulting sound is realistic enough.
11 MB for a dedicated digital piano was really little even for the year 2000. Roland released its SRX 02 Concert Grand expansion in 2000, it has 64 MB in 16 bit format or 32 MB physically. I still consider it one of the best Roland pianos, if you like its direct and warm, but not brilliant sound.
But your example shows what I recently said about the Kronos versus M3 Xpanded piano: the first megabytes already contain the most essential components of the characteristic sound. 11 MB is insufficient nowadays, but Everything beyond 100 MB only adds details you only detect when listening very closely or playing specifially like holding the decay a long time.