those "platforms" you mention hardly associate with hft. Those platforms are extremely basic and limited retail-geared testing and trading platforms and that's about as much compliment as they deserve...
At least the author was being honest:
"quantitative trading is an extremely complex......area of quantitative finance."
"In order to carry out a backtest procedure it is necessary to use a software platform."
However, I totally disagree with this:
"For HFT strategies in particular it is essential to use a custom implementation."
That may have been true 5-10 years ago. Now, there's tons of proven platforms out there now....Tradestation, Multicharts, TT, etc.
It's an enormous task to create a solid backtesting platform from scratch. When Tradestation first created TS2000i, it was like a million lines of code....and when they couldn't fix the bugs, they ended-up rewriting it as SAAS.