No.
If you read the full answer by @Demise , this is for scenario when somebody enters the US on immigrant visa such as CR1 / IR1 and receives GC by mail later.
In this case, Resident Since on GC and date of entry on immigration visa are the same.
In other cases, these may be different.
3 years of being a LPR is the requirement.
Also, for example, if one got GC in 2 weeks after entering on immigration visa, left the US immediately and spent 4 months overseas... They should start counting residency since they're back from that trip. Otherwise USCIS may say they were not residing in the US wheb they got GC.