No. Funds held in the I-Bonds bucket cannot be spent with the Yotta Debit or Credit card.
I-Bond bucket funds must be held for a minimum of 1 year, after which they can be transferred to the core account or to another savings bucket. Please note that if you cash out funds from the I-Bonds bucket after 1 year but before holding for 5 years, you'll lose the last 3 months of interest.