In answer to who pays him, I can't see who funded this study. But, Carl Svensen also has another study on the web, in a different area, working with Novartis as a collaborator. Who has close ties with Novartis?
"Novartis has completed the sale of its Gerber baby foods business to Nestlé for USD 5.5 billion, the final step in a divestment program to focus the Group's strategy on healthcare with pharmaceuticals at the core."
Realworld, I used to wonder why shouldn't Nestle et al make money from selling formula, if people want to buy it. And fair enough, in developed countries where we all have a kettle to boil water, access to clean water, access to soap/sterlizers, and enough money so that you can buy enough formula such that you can use the correct dose and don't have to over-dilute it and starve your baby.
But when I found out how mothers in the developing world are "encouraged" via a variety of methods employed by infant formula manufacturers to bottle-feed, despite their world being the polar opposite of what I have just described, that is when I realised why it is important that someone tries to keep these companies in check.