Defending champion Egan Bernal also arrived with the leading group and was able to improve his overall ranking to second place.
"It has been a difficult decision to make but unfortunately I will not be competing in Europe this year," Barty said on social media on Tuesday.
Bayern remains the league's flagship from an international perspective, the official underlined.
On paper, the Real Madrid squad doesn't look much stronger ahead of the new campaign than it did at the end of the last one, and any major arrivals appear unlikely. However, the summer chaos at FC Barcelona and the fact that Atletico Madrid haven't made any signings either implies that merely by standing still, Real could open up a gap.
Simiyu takes over from New Zealand national Paul Feeney who left the post in April citing concerns over the COVID-19 pandemic.
"The pandemic really has affected us tremendously. But I have not wasted my time. Instead, I kept improving my techniques. I was ready for this competition," he added.
Mbappe, scoring the only goal in France's victory over Sweden on Saturday, tested positive for COVID-19 on Monday and was separated from Didier Deschamps' squad right after receiving the result.
Since the running event usually draws more than 60,000 people including family members, the city council of Budapest has limited the number of major running events to three per year, in order to cause less disturbances in the traffic of the Hungarian capital.
In the other matches on Monday, Anhui defeated Jiangsu 3-2, while title favorites Qingdao Renzhou and Ruichang Biyuan both extended their winning streak by beating Hunan Hualai 4-1 and Xiamen Tefang 4-1 respectively.
Necaxa's night went from bad to worse when midfielder Claudio Baeza was sent off after being shown a second yellow card for a bad challenge on Pedro Aquino with 13 minutes remaining.
It was a tough day for all cyclists as the mountainous stage 8, a 141km ride to Loudenvielle, featured three challenging ascents which scattered the peloton.