BMW genius don’t know about their own products so I suggest not listening to everything they’re telling you because BMW configurator lacks information therefore they assume based on what they read. I am very aware that the Pro pack does not mention HiFi speakers which is why prior to collecting my i4 I was not too happy but I LITERALLY own the car and I drive it everyday, M Sport Pro consists of 4 speakers at the front doors, 2 woofers under the front seats, 2 at the rear doors, 1 in the center dash and 1 woofer hidden in the rear I believe.
If you were to have base speakers you do not have a center dash speaker, I had 6 speakers in my 2020 BMW and visually there were only 4 speakers, 2 at the front and 2 at the back in the entire car (with 2 under the seats = 6).
These HiFi speakers are definitely better than the base speakers, even when I went to pick up the car collection day I asked the dealer why he informed me via email it has base speakers and he denied he ever told me that. Iconic sounds require HiFi speakers at the minimum for a good experience and I guarantee you that it has 10 speakers, 7 you can visually see and 3 under the seats.