The Short Version
No credible evidence supports the allegation that the jhalmuri vendor was a disguised SPG operative. The claim originates from a political accusation by West Bengal Chief Minister Mamata Banerjee during an active election campaign. Multiple independent news outlets have identified the vendor as a civilian migrant worker from Bihar who publicly denied any SPG affiliation. The Hindu explicitly notes the allegation remains unverified, and the government's official account makes no mention of any such operation.