Thats not true at all.
I have competed against Brett many times in athletics and he has run some incredible times. He has also run them at the GPS championships where it is electric timing, I won't quote a time until I can dig one up but he has run on record a lot quicker than 10.8 electric.
On inspection the only GPS record he holds is the U16 200m which he ran in -
21.85s 2003 B.T. Stapleton - TGS - TGS.
However the only reason that is the case is because he ran in the open division from the time he was 15. He won the open 100m three years in a row - however it meant that he didn't get the 15 and 16 year old records because he was competing in the opens. Using his wikipedia as a reference in his senior year he pulled his hamstring 5 metres from the line, however he still won the race but the injury cost him the record. He still ran
10.69 electric with the injury. If he has run in his own age group and with better luck it is realistic that he could have owned both the U15 and open GPS 100m records, but alas he owns none. It is debatable if he would have broken the U16 record because it was a legendary run that has not been broken for 25 years.
The name of the person who holds the records the he couldn't break was a man by the name of Lynton Johnson who is legendary in Australian athletics. He was an aboriginal man from Ipswich Grammar in the mid to late 80s who ran times that had the entire Athletics body in this country at his feet and he was destined for stardom. However, one night on the drink he put his arm though a glass window and severed many of the nerves in his arm. He went back to running after the injury but he could never reach the same dizzying heights again.
If anyone is interested Lynton ran this time as a 16 year old;
10.59s 1986 L. Johnson - IGS - IGS
For those interested the entire set of records can be found at this page.
http://www.gpsqld.org.au/
The times of 10.2 that have been reported are times that he has run at other competitions and were probably hand timed, however I have seen him win races after giving the competition a 10 meter start and would not doubt any time that has been quoted.