Looking through the abstract of some academic papers, it seems that in economics literature, "entrepreneurial entry" means not only the opportunity for people to devise new products, but the general phenomenon of people deciding to switch to self-employment, or to start their own businesses.
"Much of prior research recognizes that entry into entrepreneurship involves a comparison of expected economic returns in a venture to some threshold level of acceptable performance." -https://www.sciencedirect.com/science/article/pii/S0167268112002016
"Interest in the role of entrepreneurial entry in innovation raises the question of the extent to which tax policy encourages or discourages entry. We find that, while the level of the marginal tax rate has a negative effect in entrepreneurial entry, the progressivity of the tax also discourages entrepreneurship, and significantly so for some groups of households." - https://ideas.repec.org/h/nbr/nberch/10808.html
"This paper utilizes the Panel Study of Entrepreneurial Dynamics (PSED) dataset in investigating black and Hispanic entrepreneurial entry as compared to white nascent entrepreneurs around three important dimensions: motivation, business strategy, and community resources." - https://www.worldscientific.com/doi/abs/10.1142/S1084946712500033
From these examples, I think "entrepreneurial entry" simply means "entry into entrepreneurship".