Having said all of that, an article on the NHL site from four weeks ago has Soderstrom on the roster. Not sure where
@Hockeyfrilla is seing him as having been removed? Are these rosters on the IIHF site now? I wasn't able to locate rosters for this showcase last I checked.
World Junior Summer Showcase features top 2019 NHL Draft prospects
SWEDEN
GOALIES: Jesper Eliasson, Vaxjo Jr., SWE-JR (Detroit Red Wings); Olof Lindbom, Djurgarden Jr., SWE-JR (New York Rangers); Erik Portillo, Frolunda Jr., SWE-JR (2019 draft eligible)
DEFENSEMEN: Axel Andersson, Sodertalje, SWE-2 (Boston Bruins); Tobias Bjornfot, Djurgarden Jr., SWE-JR (2019 draft eligible), Philip Broberg, AIK, SWE-2 (2019 draft eligible); Adam Ginning, Linkoping, SWE (Philadelphia Flyers); Filip Johansson, Leksand, SWE-2 (Minnesota Wild); Nils Lundqvist, Lulea, SWE (New York Rangers); Mattias Norlinder, Modo Jr., SWE-JR (2019 draft eligible);
Victor Soderstrom, Brynas, SHL (2019 draft eligible)
FORWARDS: Oscar Back, Karlskoga, SWE-2 (Dallas Stars); Jonatan Berggren, Skelleftea, SWE (Detroit Red Wings); Filip Cederqvist, Vaxjo, SWE (2019 draft eligible), Albin Eriksson, Skelleftea, SWE (Dallas Stars); Samuel Fagemo, Frolunda, SWE (2019 draft eligible); David Gustafsson, HV 71, SWE (Winnipeg Jets); Filip Hallander, Timra, SWE (Pittsburgh Penguins); Karl Henriksson, Frolunda Jr., SWE-JR (2019 draft eligible); Alexander Holtz, Djurgarden Jr., SWE-JR (2020 draft eligible); Marcus Karlberg, Leksand, SWE-2 (Columbus Blue Jackets); Jacob Olofsson, Timra, SWE (Montreal Canadiens); Lucas Raymond, Frolunda Jr., SWE-JR (2020 draft eligible); Lukas Wernblom, Modo, SWE-2 (2019 draft eligible)