No, Rufly does not provide an unlimited‑data eSIM for Spain. The plans listed under the name Spain Unlimited actually offer a fixed allowance of 500 MB per day at full speed, after which the speed is throttled to 5 Mbps for the remainder of each day.
These are fixed data plans: for example, the Spain Unlimited 7 Days plan costs $22.39 USD and is usable for 7 days, the Spain Unlimited 15 Days costs $33.60 USD for 15 days, and the Spain Unlimited 30 Days costs $44.80 USD for 30 days. All of these plans have the same 500 MB per day limit, and optionally reduced speed after the daily cap is reached.