• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Amplifier impedance is higher than speaker impedance

i found a picture they caught adding a resistor in, can i use this way? Is the audio signal attenuated?
 

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I also suggest to try the resistor in series because it is a cheap fix, easy to try. You will need to turn the volume higher to compensate for the attenuation and you will hear a change on the low frequency reproduction. On your speaker I guess that the resistor will make the the top end better, but you need to try. The transformer will impact the sound quality less than the resistor. If you like the amplifiers, the best route is to replace the speakers with 16 ohm ones.
 
I think this is a joke? But if not? Ridiculous!

This is not a joke nor is it ridiculous.
It is a variant of the idea of ​​resistance (which is the simplest, as I have already proposed) but it not consume power constantly, instead, it will act as a variable inductor, which is ultimately what another speaker would do. I don't see what the problem would be, have you never seen cabinets with multiple speakers? They are called two-way, three-way, etc.
It is evident that you have no idea and / or imagination of how to combine basic electronics with the elements that you have at your fingertips to quickly achieve a solution to a certain problem.
In case you have not understood correctly, I said cut the cone, not the spider, so it will act without leaving the VC from the gap of the magnet.