these pointers from the Russian Orthodox Church regarding St. Augustine.
The arguments in that article have been (
very strongly) articulated elsewhere by Orthodox theologians in the 20th century, notably Fr John Romanides, Christos Yannaras and Metropolitan John Zizioulas. In fact, many of the article’s sentences
seem to be a copy and paste (word for word) of a paper presented by Romanides at an Anglican-Orthodox conference in the 1970s on the
filioque.
In any case, Romanides had a
very negative view of Augustine, and essentially understood him as the archetype and origin of all Western Christian (whether Catholic or Protestant) heresies. Some of his contemporaries, such as Yannaras, have attenuated their criticism of Augustine, but Romanides’ views are still very influential, especially amongst traditionalist Orthodox.
It’s difficult to present concise answers to your questions as much of the article touches upon some rather specific theological and philosophical teachings of Eastern Christianity (which is beyond the scope of this thread). If you want a more balanced Eastern view of Augustine, I would recommend reading Demacopoulos’ and Papapnikolaou’s
Orthodox Readings of Augustine.