Yes, you are right,shaikh is mostly writing about those who are not real Awlia,but generally Hazrat Shaikh ul islam ra is not considered too sympathetic towards sufia either,so his targets might be a bit wider than just fake sufi,s.wallaho alam. One thing i know, Hazrat Shaikh ul Islam was respectful to shaikh Abdul Qadir Jilani ra,and has even acknowledged his Karamat.
And Umar, Ahle sunnat have consensus that " Karamat of Awlia are Haq"The reason being Karamat is not from wali, it is from Allah swt to honour his wali.(as word karamat itself means:an honour),so we don,t need to find asbab behind it,because it is produced by musabbab ul asbab.