Simba is so cute!!
While I wouldn't think that 6 months is "too young" for a first grooming (we took ours earlier than that), if it was his first time, sometimes groomers will not do a full groom the first time. It's important to make that first grooming a positive experience with no stress to set up good grooming for the future. Our groomer didn't do much the first times, just sort of got them used to her and the instruments and going, etc. Maybe that's what she really meant.
But aside from all that, Simba is so cute!!