it is not okay at all.

view

design of these links is not good for user. why some anchor may start with strange numbers?

#2-what-does-it-mean-block-styled
#3-what-is-clean-data

it will be better to use numbers at the end of line:

#what-does-it-mean-block-styled-2
#what-is-clean-data-3

code

anchors should not be changed cause they could be used in links. that's why it should be static. your code adds count numbers before each header then if i'll change the order of headers for some reasons saved anchors may die.

example of changing the order:

#what-does-it-mean-block-styled-2 -> #what-does-it-mean-block-styled-3
#what-is-clean-data-3 -> #what-is-clean-data-2

also it will be good to upgrade the function for generating anchors or create another one as wrapper because we may need to use in on the backend side such for a search results.

idea

and the most valuable reason why we should not solve the problem this way. it's a bad approach in article editing to use same headers in the single page. then all pages with duplicated headers should be edited according the writing rules. this way we will have no reason to add any kind on additional identifiers such a numbers.

if you really need to add two identical headers to the page then you need to start adding counters from the second one. for the most cases headers will stay without any postfix:

#example
#example-1
#example-2