No they are not because Gurbani says while standing and sitting meditate on his name.
You statement is no different than RSS claiming sikhi jainism buddhism are branches/came frome Hinduism. Gurbani defines the yoga referred to as above and the one you refferred to as 3HO practicing as false practices. Gurbani does not accept these yogas. Only yoga accepted by Gurbani is where a sikh is attached to gurbani through meditation on Gurbani while sitting or standing. No posture no mudra, only requirement is to attach the mind to Akal Purakh.
Mukhti is only rewarded through the one way of the gurbani. Every other way is done in vain.
Yog means to join together. Akal purakh unites to himself those who are lost. Plus God has many names. He is called Alluh as well and since Alluh of all Alluh disapproves of yoga you are shown your foolishness.
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