I can only give you the facts. Whether you choose to accept them or not is another matter. They are real interest bearing T-bills. They represent an obligation for the USG to honor them. They are included in our $16.4 trillion national debt and they are included in the calculation of our debt ceiling.
Anyone who knows anything about SS understands that the contributions you make to SS do not belong to you. SCOTUS has already ruled on that in Flemming vs Nestor. Congress can change the benefits anytime they want. They did in 1983 when they raised the age for full benefits from 65 to 67. You can pay into SS for 50 years and not collect a red cent except for a small burial allowance should you die before being eligible for benefits. There is no individual SS account with your name on it.
If you buy a T-bill the government owes that money to the bondholder, if you pay FICA the government gives an IOU to itself(when there was a surplus), spends your money and calls it a trust fund. Its a complete scam.
SS is a Ponzi scheme, but once you make your contributions, the money no longer belongs to you. You have no claim on it.
So the government pays itself interest on money it loaned itself that it got from some people and gave to others.
That is like the government paying itself interest on the money it taxed the top 1% to give to the bottom 40% and claiming its a trust fund.
That means nothing, The same gubment would put a private corp in jail for such a scam.