I'm not sure that it's an urban legend, because we haven't had the issue on the table.
I'm not an expert in bankruptcy and I'm not an expert in the corporate raising of money, but I guess what I would observe is the following if I was lending to a corporation that didn't have a defined benefit pension plan. If I was told that if the corporation adopted a rich defined benefit plan, even if it was adopted after I lent them the money, and then it went under, with no money in the pension fund, all the pensioners who had been given a pension in that last year would get the corporate money before I, who lent the corporation money, would be repaid, I assume that what I would do is put in a debt covenant saying that there are things with pensions that the corporation is not allowed to do in exchange for accepting that loan.
I think borrowers will be rightfully very concerned about corporate amendments that improve pension plans with no money in the pension fund to pay for them. They'll be rightfully concerned about corporations having risky investment policies. They would know that what often happens is that companies go bankrupt at unfortunate times, when stock markets are down. If they have a risky investment policy, again, the creditors are the parties exposed.
I think there will be a lot of strings attached to the loans that go to those corporations. They'll decide that it would be better not to have a pension plan, or that if they have a pension plan, it would be better not to improve that plan, because it will make their borrowing situation quite complicated.