No they just list it that way so you know you can split the ports with breakout cables so a QSFP28 can be a single 100G or 40G, or 2x 50G, or 4x 25G or 4x10G
It is based on a Broadcom Tomahawk.
I have seen other implementations that force you to do blocks of ports at a time (like 8 at once) into a mode, but i don't see any note of that in the User manual with a quick browse. Someone with the switch can probably confirm.