It's likely, as the kids say, "fake news". From the BBC:
> However, many scientists - particularly in the UK - remain highly sceptical of the effectiveness of cloud seeding. Even if it is theoretically possible, one of the problems for proponents has been to demonstrate that a rainfall or snowfall was caused by the seeding or simply occurred spontaneously.
> However, many scientists - particularly in the UK - remain highly sceptical of the effectiveness of cloud seeding. Even if it is theoretically possible, one of the problems for proponents has been to demonstrate that a rainfall or snowfall was caused by the seeding or simply occurred spontaneously.
Don't believe everything you read.