Hi @rkiuchir
That notebook has been edited three years ago. Meantime Plotly changed so much, that you can simplify the text to be displayed, using hovertemplate, in the surface definition and removing text and hoverinfo.
namely, the hovertemplate should be defined as follows:
hovertemplate = 'lon: %{x:.3f}'+\
'<br>lat: %{y: .3f}'+\
'<br>z: %{z:.3f}<extra></extra>'