I agree with your post. Along with Swami Visvaksen's Saying, Bhagwan Swaminarayan Has also written in the Vachnamrut Gadhada Section 1 that
"Aa jivne, jyaare bharatkhand ne vishe manushya deh aave chhe, thyaare bhagwaan, ke bhagwaan na akhand dharak sant, te prithvi par avashya vicharta hoy chhe"
this means that Until The day to where there will be humans on this earth, untill that day, Either I, or my truest devotee, or Saint, will always be travelling on this earth spreding TRUE Vaishnav Dharma.
So this is proof that he is Supreme god and he is today on earth in the Form of Pragat Guruhari Pramuck Swami Maharaj, who is the "Akhand Dharak Sant" that shreeji maharaj speaks about in this vachanamrut.