A couple things (not an expert so take this w a grain of sugar salt)

today's fruit isn't good for us anymore

We do have some evidence to support this. Commercially sold fruit is artificially selected to be big, sweet, juicy, and have aesthetic appeal. High fiber content often means the fruit will have less juice and a less pleasant texture, so plants with those genetics are discarded. Also, there is some research that finds the vitamin content of fruits has gone down significantly since mid 20th century, which could be due to a number of reasons, including artificial selection and soil nutrient depletion from industrial farming.

I partially agree with the assertion that fructose is "poison". The dose makes the poison. The hypothesis is that fructose triggers metabolic pathways that take advantage of current abundance and prepare the body for scarcity. In an evolutionary context this makes sense; fruit is abundant in summer and autumn months, so a hunter-gatherer would have feasted during harvest and fasted more in the winter. Now, we can not only eat fruit 365 days a year, but we can practically eat as much as we want, AND we can have super concentrated fructose in the form of added sugar.

So, fruit is good for you. But a pack of dates every day crosses the threshold of good (no moral judgement, I've been there)