Just seeing the thread number for this to compare with the Forums Home version.
According to Forums Home this is thread #200,262.
However, the threadid# is 206,701.
To locate the closest to the 200,000th thread (according to the Forums Home count) you have to subtract 262 from the threadid# to get 206,439.
Plugging that into the URL will retrieve the closest to the 200,000th thread that can be determined today. Some threads will have been deleted between the time the Forums Home count flipped to 200,000 and now.