The champion pair retired after the 2016 Olympic Games, where Eaton won decathlon gold and Theisen-Eaton took the heptathlon bronze medal.
Simbine, whose Diamond League winning time of 9.93 is tied-fifth best in the world this year, is confident he can win the final on September 28.
"This decision creates much-needed parity and clarity for all athletes as they prepare for the World Championships in Doha this September."
The ruling means the 28-year-old can no longer compete in events between the 400m and mile, as she did in June and July. The World Championships are scheduled between September 28-october 6 in the Qatari capital.
The 29-year-old Muhammad obliterated one of the longest-standing records in women's track and field on Sunday, storming home in 52.20sec at Des Moines' Drake Stadium.
The 33-year-old American superstar failed to clinch a 400m berth for the World Championships after only finishing sixth at Drake Stadium, but could still travel to Doha as a member of the USA relay squad.
Coleman, who had comfortably outpaced world champion Justin Gatlin to win his semi-final in 9.96sec, led virtually from start to finish in the final at Drake Stadium to win in 9.99sec.
The 28-year-old Qatari leapt 2.27m while Bulgaria’s Tihomir Ivanov came third (2.24m).
Ingebrigtsen, 26, finished second behind Ethiopia's Samuel Tefera in the race, which is not an Olympic or world championship event, in a time of three minutes 49.60 seconds.
The 32-year-old Jamaican, twice Olympic champion over the distance, got away quickly and never looked like being caught by Britain's Asher-Smith (10.92sec).
The Qatari injured his ankle last July, going for Javier Sotomayor's world record at Gyulai Memorial in Szekesfehervar, Hungary.
World high jump champion Barshim returned to action only last month and won gold in his comeback in Sopot.
The Polish Olympic champion underwent knee surgery and will target the 2020 Tokyo Games.
Kipyegon made a long-awaited return with a stunning 1500m victory in 3:59.04 at the IAAF Diamond League meeting in Stanford last month.