It's not that simple - frequency and modulation can make a difference in terms of biological interactions. Not that I believe there to be any harmful effects.

The article specifically mentions field strength alone exceeding health recommendations. This can easily be measured and debunked. Other claims will be addressed separately.

Frequency makes a difference, by affecting penetration and energy level. Signal modulation leads to harmonics and/or pulsing fields, but saying that modulation matters is quite misleading as it is simply frequency and power variation.

(For 5G, the end-result should end up being less energy as reduced cell size leads to reduced broadcast power on both ends of the connection, dissipated entirely as heat in a lower volume of tissue as penetration depth has dropped - a net win)