Funny article man, these ShiaPen guys have one strategy, and that is to bombard you with walls of text hoping you'll simply get tired reading it, and not bother responding.
So, they use a Qur'anic justification to condemn folding hands in Salaat. They cite the following verse:
الْمُنَافِقُونَ وَالْمُنَافِقَاتُ بَعْضُهُم مِّن بَعْضٍ ۚ يَأْمُرُونَ بِالْمُنكَرِ وَيَنْهَوْنَ عَنِ الْمَعْرُوفِ وَيَقْبِضُونَ أَيْدِيَهُمْ
The hypocrite men and hypocrite women are of one another. They enjoin what is wrong and forbid what is right and close their hands.
Qur'an 9:67
So "Qabd", folding the hands, has been associated with the hypocrites.
How about this verse:
إِنَّ الَّذِينَ فَرَّقُوا دِينَهُمْ وَكَانُوا شِيَعًا لَّسْتَ مِنْهُمْ فِي شَيْءٍ ۚ إِنَّمَا أَمْرُهُمْ إِلَى اللَّـهِ ثُمَّ يُنَبِّئُهُم بِمَا كَانُوا يَفْعَلُونَ
Indeed, those who have divided their religion and become sects (Shias) - you, [O Muhammad], are not [associated] with them in anything. Their affair is only to Allah; then He will inform them about what they used to do.
Qur'an 6:159
We will stop folding our hands if you stop being Shias ^^
They also say:
A Momin does not wish to share any similarities with the Jews, likewise folding the hands in the presence of the Creator.
Do Shias eat pigs?