I should point out that nobody has required Kiss to perform with their original lineup, RARHOF have requested that, but they have not barred Kiss from performing with whatever lineup they choose. This is always the case with these performances.
Kiss never wanted to perform at all, they are on record as having dissed the HoF many times over the years. This is just an excuse to throw their toys out of the pram, nothing more. If they wanted to perform with their current lineup, they are absolutely free to do so.