scam virtual dealer plugin being used to delay signals

I witnessed the delay in signals from mql5 signals , when I subscribed to perfect trend signals.My signals was sometimes never executed , by end of signal subscription month , I realized it was a scam .The signal scammer showed 8,000 % profit , but after 1 month of subscription , signal was removed on mql5 site.

Can brokers try to delay your signal execution?
scam virtual dealer plugin being used

The Virtual Dealer is a MetaQuotes plug-in available to Forex brokers that offer the MetaTrader 4 - metatrader 5 platform. The dishonest plug-in allows the brokers to delay an order placed by a trader from 1-5 seconds. Some brokers have used this plugin to induce intentional slippage, I see my broker uses it all the time, my orders don't get filled.