Though only a handful of WB Affiliates (outside of the Tribune stations) had news outlets in '98, affiliates like KWBP Portland, OR and KUWB Salt Lake City would often provide weather forecasts and updates.
Although only a handful of WB affiliates had news outlets at the time (except for the Tribune stations) with others having newscasts produced by their local affiliates (ABC, NBC, Fox, CBS), The WB still should've had an affiliate news service to compete with ABC NewsOne, NBC NewsChannel/Skycom services, FOX NewsEdge, CBS Newspath and CNN Newsource (which Tribune provided video feeds to).
Select WB Affiliates without news outlets (or newscasts produced by local affiliates) would run All News Channel (SBS6) I believe (or rely on news coverage from CNN), in addition to syndicated programming and movies.
Any mention of news feeds is with respect to content from the mother ship. They make mention of "backhauls of all kinds" but they don't say whether it is from the affiliates or from network-sponsored production trucks.
There's little to nothing there to support your claim. There are more reasons why you shouldn't use Ku than evidence that the affiliates did might have.
Speaking of WB Affiliates with newscasts KNVA-TV (which had a 5:30PM newscast produced by KXAN-TV until June 1997), would often run news updates under the "54 News Now" banner. They would have a looping of local weather throughout the midnight hour (2AM to 6AM).