It would have been outrageous.
Someone should not be prevented from going through because of a disability but equally, someone should not get put through because of a disability. However, once anyone is put into such a situation, individual needs must be met and appropriate support given, because these are not stage school trained, or professionals in the field, they aren't used to it, haven't built up to it, they are just ordinary people who often have no clue what they are letting themselves in for and they may need a bit of input (anyone, not just, for eg, someone with LD).
Many people won't need or want any particular support, others might. It's that understanding that the realisation that the fantasy is so different from the reality might be tough for some people and they might need some support that is missing.
If any of that ramble makes sense
I hate these shows with a passion and I blame my sister for insisting that she had to watch the final while staying at my house.