6% Profit Sharing Limit (w/CB Plan) + PBGC

I was just reading something and came across a note I had never seen before.  Is it true that if the Plan is covered by the PBGC, the 6% limit on employer contributions into the Profit Sharing Plan doesn't apply?

We always adhered to the 6% rule, even for PBGC Plans, but what I read seemed to imply that it wasn't the case.  So I just wanted to make sure I was reading this right.

Thanks in advance

That's correct. The combined deduction limit doesn't apply if the DB plan is covered by PBGC. IRC 404(a)(7)(C)(iv)

12 minutes ago, C. B. Zeller said:

That's correct. The combined deduction limit doesn't apply if the DB plan is covered by PBGC. IRC 404(a)(7)(C)(iv)

Great, thank you!  Is there any limit?  Or they can go as high as they want to?

Just the usual 25% limit.