And? He wasn't supposed to face Bizarro, or Zod, or Faora, certainly not Darkseid or DOOMSDAY when he was a teen and pre-Superman. Yet that happened anyway.
The difference is that he wasn't "Superman", but it was still Superman. Clark didn't call himself Superman, but it's still ultimately the character.
This show won't feature Batman. It won't feature Bruce Wayne, and if it starts with the murder of his parents, he would be a child anyway. Teenage Clark got into some Superboy-esque adventures and later was Superman without ever being called it, but eight-year-old Bruce won't be doing anything of the sort in this show. You can have a show where teenage Clark faces off against Brainiac a lot easier than you can have a show where preteen Bruce faces off against the Joker.
the network/production company wants a successful TV show that exploits the very popular Batman mythos without including Batman in any obvious way
This is easily possible. Birds of Prey explicitly referenced Batman, but he was not a main character. Smallville exploited more than a few Batman-related characters and made tongue-in-cheek references to Batman. Arrow has gone even further with using characters traditionally connected to Batman, in some ways putting Oliver in what could just as easily be Bruce's place in a story.
At various points in the past, shows starring a young Dick Grayson, Nightwing, or a Gotham Central adaptation were considered for development. Any of them would be a way to touch the Batman mythos, but none of them requires Batman to actually appear in the show. Smart writing could even have them smartly alluding to the Bat without ever even talking about him directly. Heck, even Arrow has refrained from having the hero take the name "Green Arrow", usually going by "the vigilante", "the hood", or now, just the "Arrow". The animated Teen Titans was initially not allowed to use the Batman character, but told many stories featuring their version of Robin, occasionally referencing his past with Batman without actually referring directly to the character.
It's possible to touch Batman's corner of the DC universe without him ever appearing or being named, and considering that Gotham Central and Dick Grayson were previously looked at for TV shows, I know that the producers should know it's possible.