No-one was arguing that that was not the case. A spring might have the
mechanical equivalent of reactance, but a damper will most certainly
not - hence the rubbish posted by the OP, where he believes that
dampers store energy. They do not, and therefore cannot have the
mechanical equivalence of a reactance. Therefore, resonance is not
possible with such a system. In the extreme, the OP was reduced to
likening dampers to bicycle pumps, a sure sign of a failure to grasp a
fundamental point (and hence the error of his assertion).

from
Aero Spike

Is this what you are talking about?

"The same analogy applies to springs and to shock absorbers;
the spring stores energy when stretched; the shock-absorber
stores energy when compressed. Both the spring and shock
absorber will return energy at some time and this exhibit reactance!"

I think we have been at cross purposes. The above is nonsense.

Frank