The above pangtee refer to "Hari Jan".
Before you jump the gun in defending Santa Sio as "Hari Jan", understand who exactly SatGuroo has called a a "Hari Jan" :
ਆਠ ਪਹਰ ਜਨੁ ਹਰਿ ਹਰਿ ਜਪੈ ॥
ਹਰਿ ਕਾ ਭਗਤੁ ਪ੍ਰਗਟ ਨਹੀ ਛਪੈ ॥
Hari Jan jaaps naam 24/7
Hari Jan never hides
If Santa Sio (as Jatheydaar..and as what his followers call him as "panth patshah"- so called) was truly a Hari Jan with 24/7 naam kamae, its unlikely any force in the world could have made him bend to Indhira. Secondly, as Jathedaar of guru ki fauj, we don't know where he was during and after when Sri Darbar Sahib was under attack.
Many Sikhs turned their back on the Panth in 1984, but Santa Sio as not only remained dormant. He betrayed panth by bowing to Indhira . What does Gurbani say of a person like this?
ਸਾਹਿਬੁ ਸੰਕਟਵੈ ਸੇਵਕੁ ਭਜੈ ॥ If the servant runs away when his master(Satguroo) is in trouble,
ਚਿਰੰਕਾਲ ਨ ਜੀਵੈ ਦੋਊ ਕੁਲ ਲਜੈ ॥੧॥ he will not have a long life, and he brings shame to all his family. ||1||
Santa Sio's jivan in panth ended when Panth declared him as tankhaiya. There is no sin in his ninda , neither was a "Hari Jan" in anyway.