The Germans, who are favourites after winning the last three world championships, were placed in the same heat as reigning Olympic champion Canada and host nation Britain, which is also an outside candidate for gold.
Holtmeyer says "you really wonder how (governing body) FISA does the seedings."
FISA confirmed it received a complaint, which was later withdrawn. The body wouldn't say which nation made the complaint.
The seedings are based on the results from last year's world championships and the last of the three World Cup regattas this summer in Munich. Canada didn't race in Germany and therefore wasn't seeded.