I think you're mixing up two different pressings of this 45.
If I read the sales blurb on his homepage right, the white labelled K-CITY 45 of this (which he is selling for $650!) features a slower version and was pressed in 2012 (it has been "sitting on the shelf for 34 years", 1978+34 = 2012).
The black labelled PROMO copies were pressed in 1978.
The promo that I've got is definitely not a 90's or 2010+ pressing.
From the homepage:
"I WANT TO SHARE MY LOVE WITH YOU
This vinyl 45 was never released and only a few promo copies were pressed in 1978. This was the year the new Disco Scene became all the rage, so the K-City Records team decided not to release ”I Want To Share My Love With You.” The song has been sitting on the shelf for 34 years and now some of you lucky fans with your own copies have begun to sell those 45s, because of the music’s exclusivity. The buyer of the slower-tempo arrangement of “I Want To Share My Love With You” 45 vinyl record will receive a complimentary Bio with an autographed photo from the original artist "Mr. Eugene Smiley" of The Essence of Love. This Collector’s Item is in very good condition."
https://www.kcityrecords.com/buy/rare_soul_music_collection_i_want_to_share_my_love_with_you/
Am I missing something here?