Yes you can delete or add ages of a pdf file in Delete Pages In Pdf Illustrator. According to illustrator property. page is nothing but an Artboard to illustrator so it considered as Artboards. What you do is you delete or add your artboards normally. Then rearange the artboards according to your needs. Thank you.
To delete an Illustrator PDF page, click on Edit>Page and then On Page or Edit>Page and delete the PDF Page. This is pretty much standard operation in Adobe Illustrator. Click in the top right corner (it should be the pencil icon). Look for Page and the arrow will show you where the current page is (it might also show you the Page properties on the top of the Page toolbar). Click on the page. Click Cancel and then on “Page Info” click “All Page Info” and then click “Show”. You will see the current page that should be displayed in the upper right part of the page. You can now delete or move on to the next page. To add an Illustrator PDF page, press Ctrl + Shift + E (or select the arrow at the bottom right of the page toolbar) and select “Add > PDF.