Christopher Matthews is a bit of a non-traditionalist who utilises "physical re-creation, experimental archaeology, and ballistics testing" to reconstruct the physical mechanics of phalanx combat. He works not far from where I study and has also taught at my University, though unfortunately I've never met him. He's a highly educated re-enactor with an obsession with something that can never be decisively determined, but as traditional classicists who focus on the literary sources to re-create ancient battles (like me!) are a dime-a-dozen, his approach is potentially very useful and worthy of consideration. He has multiple publications and is currently employed as an academic with a very specialist bent so I'd say his fairly qualified to put forward his somewhat controversial opinions (controversial as much due to his non-traditional method as anything else). I'm always skeptical of re-enactors and war-gamers (even though tabletop war-gaming is awesome), but this guy seems to be the real deal.

His work on the Hellenistic phalanx is clearly an extension of his previous work on the Greek phalanx. His book on the mechanics of Greek phalanx fighting in a previous work (Storm of Spears 2012) was reviewed positively by a fairly well-respected military classicist, Rosemary Sheldon, in 2014. She didn't necessarily say he was right on everything, but that he gives a fresh perspective that is worth consideration. She's quite a technical military historian herself so if she thinks it's worth a look then it probably is.

I haven't read this book and I didn't know it existed but I have to say that from what I'm reading right now, in my opinion (and /u/iphikrates who may have read Storm of Spears might be able to give a more nuanced view) it's worth a read, along with other views on phalanx warfare such as one might find in "Greek Warfare: Myths and Realities" (van Wees 2004) or "Men of Bronze" (Kagan & Viggiano 2015). I can't comment intelligently on the state of the othismos debate (whether or not hoplites literally shoved each other en-masse like a footy scrum), but I can fairly confidently say that this book would be worth a look and I've just added it to my Book Depository wishlist (it's 54% off!).