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This is completly true only in theory, because any connection, even short, between the 10k resistor and the filter will alter the impedance, since you system is not matched.

The worst case is the resistor directly connected at the output of the generator, then a coax to go to the filter.

The best case is the coax cable connected to the generator, then the 10k connected as close as possible to the filter.

Furtermore any parasitics capacitance to ground at filter side will play a role.

Of course low frequency behaves better.

What's about the purpose of this added 10k resistor ?