A major setback in the development of 'golden rice' intended to relieve vitamin A deficiency in people in developing areas has always been that the GM rice just doesn't produce enough of the desired 'pro-vitamin A' carotenoids.
Despite some two decades of failing to develop a viable 'golden rice', the Bill and Melinda Gates Foundation and US Agency for International Development (USAID) continue to fund the project.
Their latest trials involved golden rice event 'GR2E' grown in the Philippines. Analyses of this rice for carotenoids plus a lot of extrapolation, generalisation, guestimates, and calculation led to the conclusion (stated in the Abstract) that "Mean provitamin A concentrations in milled rice of GR2E can contribute up to 89-113% and 57-99% of estimated average requirement for vitamin A for preschool children in Bangladesh and the Philippines respectively".
A well-known GM promoter ecstatically announced this to be "checkmate" for golden rice's critics, and tweeted the conclusion (more or less as stated in the Abstract).