That's real BS.
Usually, the electrolytic capacitor in audio amplifiers would last many years. The new ones are very reliable.
I used the LCR meter to check the ESR, dissipation factor, and capacitance to confirm the condition of the Capacitors. Without testing them with instrument, I won't replace them without any reason.
Replacing the capacitors with different type/kind, it maybe cause distortion/problems.
If it ain't break, don't fix it.
Johnny