Can you please explicitly tell us which IMO Frequency Spread function are you referring?
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CY8C4146ＬVA-S432 doesn't have IMO spread feature.
If the customer wants to reduce CapSense emissions, then they can use PRS or Spread spectrum in CapSense.
For the reason why IMO Frequency Spread function isn't in PSoC4100S, please refer to Advantages of Fourth-Generation CapSense® – KBA211132. Specially for the Feature of EMI Reduction - Digital in the table.
4th Generation CapSense (in PSoC 4-S, i.e. PSoC4100S) itself already has spread spectrum and hence spreading IMO not needed.