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I suspect it contains a chemical to repress germination but would not effect semi-mature plants with established plant structures. Don't have time to look at the chemical make up but suspect (knowing how much the EU has banned domestic herbicides) he/she would be ok to plant up sooner. The residue effect will be designed to prevent new 'weed' seeds from germinating rather than killing new plants. It wouldn't be suitable to sow any seed on though.
The Glyphosate in the product that would help control the ground elder quickly degrades.
Given it is a 'domestic' product (ie not intended for use by PA1/PA6 qualified contractors) it will be a relatively low strength formulation.
It will carry a MAPP number which is cross referable and should link to the SDS (Safety Data Sheet). This normally states all the good & bad stuff about the poison and its residual effect;-)
The Glyphos element locks down very quickly and would not inhibit planting after 7-14 days (excepting seeds etc). It is designed to deal with existing growth
The remaining components, I suspect, would be geared towards creating a chemical pan in the soil to inhibit any growth from 'below'. Often these solutions require the chemical pan remaining intact and not disturbed thru digging. hoeing etc (which may be a way of shortening its life). I know of no antidote.
Its is fair to assume that the 4-6 months is on the safe side, so planting could place before then but would a 'risk.
Moral ? Check what you are apply first and/or use a qualified contractor IF it is on a clients property. What you do in your home/garden generally is not a s regulated or policed but I would hope people consider the environment.