The site you quoted also.blames 5G for childhood illness and is rabidly antivaxer.
The site you mention was founded by Robert Kennedy Jr, the nephew of ex President JFK and the son of Robert Kennedy. I know both men had their flaws, but I think JFK was a very good President for his time before his assassination and I also think Robert Kennedy would have been a great President had he not been assassinated as well. It seems clear that the Kennedy family frequently has a penchant for looking into things that large corporate interests would rather them not do and may well have paid the ultimate price for doing so. I applaud them for it.
Now, as to your assertions, it's true that his site believe that 5G radio frequencies can be harmful. Given the evidence I have seen, I think they have good reason to believe this. They are also suing the FCC for refusing to review their 1996 wireless health guidelines:
Robert Kennedy Jr., Chairman of Children’s Health Defense (CHD) has committed to be proactive on the concerns regarding excessive exposure of our children to 5G and wireless radiation. To fulfill this promise, CHD will be submitting a lawsuit on February 3rd against the FCC for its December 4...
childrenshealthdefense.org
As to your second assertion, Robert Kennedy is not actually an anti-vaxxer. He does believe that the current vaccine safety system is inadequate, however, as he mentioned in an open letter to President Biden recently:
Children’s Health Defense Chairman RFK, Jr. says transparency, robust science and a functional surveillance system are the only ways to build public trust for the COVID vaccine.
childrenshealthdefense.org
-I- am an anti vaxxer and think that the world would be better off if all vaccines were discontinued. My stance is shared by some of those who created the Vaxxed series of documentaries.