July is tomorrow. Putting in order only recently seems too late. There may be some elements of truth in that article but unless Sony has locked in their order months and months ago, I don't think we can see Slim in July.
Where did you get your translation? My google translation talks about "Upstream component makers" and "Hon Hai Heshuo won pie with 50 percent of all orders", bear in mind it is a google translation.
That could mean component deliveries to the assembly lines of who ever is manufacturing the units.