I have a 5yo Deka AGM and 2 x Optimas and have never equalized. Charge Volts are temp compensated. There is no such thing as a fixed Voltage.
Equalize to me means stir the liquid. That is impossible with both AGM and Gel.
Stirring the liquid is a regular maintenance procedure for wets. Do NOT make any attempt to stir AGM or Gel.
Now there is the OTHER definition that deals with individual cells that are not being fully recharged. This can happen to all LAs. This will present as a loss of capacity. That is what Lifeline means when they define conditioning for their AGMs. Conditioning is a recovery procedure AFTER you notice a loss of capacity and is performed AFTER Lifeline procedure 5.4 - Charging.
Wet folks are always coming along and confusing the two definitions.
HTH;
John