This only applies to foreign currencies relative to the US dollar, not the dollar itself given that the dollar is considered the universal, global unit of wealth. It's like saying that a 1kg weights .3k on mars. A kg is a kg anywhere. What she means to say is that "the US dollar has lost its purchasing power due to inflation" which she does later but still misleading. But this still it not quite the same as saying the dollar lost its value. The nice thing about owning dollars is even in spite of loss of purchasing power due to CPI, you have no forex risk. Foreign currencies not only losing purchasing power due to inflation but also due to falling against the US dollar.
And for longer-term savings instruments, here is a chart of the inflation-adjusted forward annualized rate of return of buying 10-year Treasury notes that year and holding them to maturity. You can see the three decades where bondholders got massacred, because the underlying dollars were devalued. During those times, anyone who bought Treasuries and held to maturity received annualized real returns of as low as -4% or -5% during the full duration of the note.
Again, all she did was cherry pick two bad periods. Over the past 100 years, 10-year bonds have tended to produce positive real returns.
Bitcoin and gold are popular but this does not make them good investments or a good hedge against inflation. Beanie babies were popular too. Overall, stocks have proven to be the best hedge against inflation. The S&P 500 has gained more than enough this year to overcome all inflation. Compare the charts of the total S&P 500 , nasdaq, or DJIA with any other asset class and stocks tend to win hands-down with few exceptions between.