Subject: Re: 30 year TIPS has highest yield in 24 years
A quick Google search says that TIPS can be sold before their maturity date, while I-Bonds
cannot.

That is not correct. You cannot sell them within the first year, true, but you can sell them at any time after that. If you do so within a 5 year window you lose the previous 3 months of interest, which is a not-very-high penalty if you really want to get out.

After 5 years of ownership you can sell them at any time without penalty.