If the news were that it was being amended to make carve outs for businesses who pay an amount of money, then I would be more inclined to agree.

But the news is that it would be repealed entirely.

This means you could not bribe the government once to protect you from all lawsuits - you would have to bribe each and every judge involved in each and every lawsuit, and/or each and every juror.

1 Billion people sue your company. I don't think any megacorp would be happy about suddenly having to pay out 1 billion bribes and to do so as a regular ongoing expense.

The least expensive option for the corporations is to not have this repealed. As a result, that is what they would prefer to put that money into instead. Way cheaper to bribe this into not passing than it is to have to do it continuously or multiple times and/or losing those income streams.